As filed with the Securities and Exchange Commission on May 10, 2006
 ==============================================================================


                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 10-Q

(Mark One)

|X|   QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934

        For the quarterly period ended March 31, 2006

                                       OR

|_|   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934

        For the transition period from _____________ to ______________


                           Commission File No. 0-19341

                            BOK FINANCIAL CORPORATION
             (Exact name of registrant as specified in its charter)

                 Oklahoma                                 73-1373454
       (State or other jurisdiction                     (IRS Employer
    of Incorporation or Organization)                Identification No.)

          Bank of Oklahoma Tower
              P.O. Box 2300
             Tulsa, Oklahoma                                74192
 (Address of Principal Executive Offices)                 (Zip Code)

                                 (918) 588-6000
              (Registrant's telephone number, including area code)

     Indicate  by check mark  whether the  Registrant  (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934 during the  preceding  twelve  months (or for such shorter  period that the
Registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days. Yes |X| No |_|

     Indicate by check mark whether the registrant is an  accelerated  filer (as
defined in Rule 12b-2 of the Exchange Act). Yes |X| No |_|

     Indicate  the  number of  shares  outstanding  of each of the  Registrant's
classes of common stock, as of the latest practicable date: 66,900,597 shares of
common stock ($.00006 par value) as of April 30, 2006.

===============================================================================
 2

                            BOK Financial Corporation
                                    Form 10-Q
                          Quarter Ended March 31, 2006

                                      Index

Part I.  Financial Information

     Management's Discussion and Analysis (Item 2)                          2
     Market Risk (Item 3)                                                  24
     Controls and Procedures (Item 4)                                      26
     Consolidated Financial Statements - Unaudited (Item 1)                27
     Quarterly Financial Summary - Unaudited (Item 2)                      36

Part II.  Other Information

     Item 2. Unregistered Sales of Equity Securities and Use of Proceeds   38
     Item 6. Exhibits                                                      38

Signatures                                                                 39

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS

PERFORMANCE SUMMARY

BOK Financial Corporation ("BOK Financial" or the "Company") reported net income
of $54.7  million,  or $0.81 per  diluted  share for the first  quarter of 2006,
compared with $52.1 million, or $0.78 per diluted share for the first quarter of
2005. The annualized  returns on average  assets and  shareholders'  equity were
1.36% and 14.35%,  respectively,  for the first  quarter of 2006,  compared with
returns of 1.48% and 14.96%,  respectively,  for the first quarter of 2005.  The
increase in net income was attributed to growth in net interest revenue and fees
and  commission  revenue,  combined with  appreciation  in the value of mortgage
servicing rights.

Net interest  revenue  increased  $9.7 million or 9% over 2005 due  primarily to
loan growth.  Average  outstanding  loan  balances for the first quarter of 2006
increased  $1.2 billion or 15% compared  with the same period of 2005.  Fees and
commission  revenue  increased $11.0 million,  or 14%, over the first quarter of
2005. All categories of fees and commissions increased over the first quarter of
2005.  Transaction  card  revenue and trust  revenue  grew $2.0 million and $1.9
million,  respectively. The $3.4 million increase in other revenue included $2.5
million of fees earned on margin assets for the first quarter of 2006,  compared
with $570 thousand for the same period last year.

The value of mortgage servicing rights appreciated $7.1 million during the first
quarter  of 2006  due to  rising  interest  rates  and a  slow-down  in  housing
turnover.  BOK Financial adopted Statement of Financial Accounting Standards No.
156,  "Accounting  for  Servicing of Financial  Assets"  ("FAS 156"),  effective
January 1, 2006. FAS 156 allows mortgage  servicing rights to be carried at fair
value,  which  permitted the Company to fully recognize this  appreciation.  The
increase  in fair  value  of  servicing  rights,  net of  recognized  losses  on
financial instruments held as an economic hedge, contributed $3.3 million to net
income for the first  quarter of 2006  compared  with $2.3  million for the same
period  of 2005.  As  required  by FAS 156,  beginning  retained  earnings  were
increased by $383 thousand for the net-of-tax unrecognized  appreciation of both
mortgage  servicing  rights and  certain  financial  instruments  designated  as
economic hedges that existed at December 31, 2005.

Operating  expenses  increased $15.2 million,  or 15%, over the first quarter of
2005.  Personnel  costs comprised $12.8 million of the increase due largely to a
$6.4 million  increase in incentive  compensation and a $5.5 million increase in
salaries and wages.

 3

RESULTS OF OPERATIONS

NET INTEREST REVENUE

Tax-equivalent net interest revenue totaled $118.8 million for the first quarter
of 2006 compared with $108.9 million for 2005. The increase was due primarily to
a $1.5 billion  increase in average earning  assets.  Average  outstanding  loan
principal  grew $1.2  billion or 15% while  average  securities  increased  $279
million. Growth in average earning assets was funded primarily by a $1.5 billion
or 15%  increase  in average  deposits.  In  addition  to revenue  growth due to
increased  earning  assets,  net interest  revenue for the first quarter of 2005
included  $605  thousand  from  the   collection  of  foregone   interest  on  a
non-performing loan and a $650 thousand fee on a large commercial loan that paid
off during the  quarter.  Table 1 shows the effects on net  interest  revenue of
changes in average  balances and interest rates for the various types of earning
assets and interest-bearing liabilities.

Net interest margin, the ratio of tax-equivalent net interest revenue to average
earning assets, was 3.39% for the first quarter of 2006, compared with 3.46% for
the first quarter of 2005 and 3.34% for the fourth quarter of 2005. Net interest
margin for the first  quarter  of 2005 was  increased  by 4 basis  points by the
previously mentioned collection of interest on a non-performing loan and fees on
a loan  payoff.  The effect of these  credits  is  excluded  from the  following
discussion.  Yields on average earning assets  continued to trend upwards due to
the effect of rising  interest  rates.  The yield on average  earning assets was
6.42%,  up 96 basis points  compared with the first quarter of 2005 and 30 basis
points over the fourth quarter of 2005. The yield on average  outstanding  loans
was 7.35%, an increase of 135 basis points over the first quarter of 2005 and 37
basis points over the preceding quarter.  The tax-equivalent yield on securities
was 4.64% for the  first  quarter  of 2006,  compared  with  4.36% for the first
quarter of 2005 and 4.47% for the fourth quarter of 2005.  Rates paid on average
interest-bearing  liabilities  during the first  quarter of 2006  increased  103
basis  points  over the  first  quarter  of 2005 and 29  basis  points  over the
preceding  quarter.  Rates paid on deposit  accounts,  which  increased 78 basis
points  over  2005,  continued  to lag  behind  the  increases  in loan  yields.
Non-interest  bearing funds and the mix of funding sources added 40 basis points
to the net  interest  margin in first  quarters  of both 2006 and 2005,  up four
basis points compared to the fourth quarter of 2005.

Our overall objective is to manage the Company's balance sheet to be essentially
neutral to changes in interest rate.  Approximately  71% of our commercial  loan
portfolio is either  variable  rate or fixed rate that will  reprice  within one
year.  These  loans are funded  primarily  by deposit  accounts  that are either
non-interest  bearing, or that reprice more slowly than the loans. The result is
a balance  sheet that is asset  sensitive,  which  means that  assets  generally
reprice more  quickly  than  liabilities.  Among the  strategies  that we use to
achieve  a  rate-neutral  position,  we  purchase  fixed-rate,   mortgage-backed
securities and fund them with short-term  borrowings.  The expected  duration of
these securities is estimated to be approximately  2.8 years based on a range of
interest rate and prepayment  assumptions.  The funds borrowed to purchase these
securities generally reprice within 90 days. The  liability-sensitive  nature of
this strategy provides an offset to the  asset-sensitive  characteristics of our
loan portfolio.

We also use  derivative  instruments  to manage our interest  rate risk. We have
interest rate swaps with a combined notional amount of $795 million that convert
fixed rate  liabilities  to floating  rate based on LIBOR.  The purpose of these
derivatives,  which generally have been  designated as fair value hedges,  is to
reduce the  asset-sensitive  nature of our balance sheet.  We also have interest
rate swaps with a notional amount of $100 million that convert prime-based loans
to fixed rate. The purpose of these  derivatives,  which have been designated as
cash flow hedges,  also is to reduce the  asset-sensitive  nature of our balance
sheet.

The  effectiveness of these strategies is reflected in the overall change in net
interest revenue due to changes in interest rates as shown in Table 1 and in the
interest  rate  sensitivity  projections  as shown in the Market Risk section of
this report.

 4

------------------------------------------------------------------------------
Table 1 - Volume / Rate Analysis
(In thousands)
                                                  Three Months Ended
                                                 March 31, 2006 / 2005
                                           -----------------------------------
                                                           Change Due To (1)
                                           -----------------------------------
                                                                     Yield /
                                              Change     Volume       Rate
                                           -----------------------------------
Tax-equivalent interest revenue:
  Securities                                $   6,312   $ 2,867   $   3,445
  Trading securities                               18        (6)         24
  Loans                                        47,142    19,869      27,273
  Funds sold and resell agreements                 75       (74)        149
------------------------------------------------------------------------------
Total                                          53,547    22,656      30,891
------------------------------------------------------------------------------
Interest expense:
  Transaction deposits                         17,500     6,552      10,948
  Savings deposits                                 81        (7)         88
  Time deposits                                11,659     4,302       7,357
  Federal funds purchased and
   repurchase agreements                        8,293       230       8,063
  Other borrowings                              3,260      (804)      4,064
  Subordinated debentures                       2,756     2,293         463
------------------------------------------------------------------------------
Total                                          43,549    12,566      30,983
------------------------------------------------------------------------------

Tax-equivalent net interest revenue             9,998    10,090         (92)
Change in tax-equivalent adjustment              (266)
------------------------------------------------------------------------------
Net interest revenue                        $   9,732
------------------------------------------------------------------------------
(1) Changes attributable to both volume and yield/rate are allocated to both
volume and yield/rate on an equal basis.

OTHER OPERATING REVENUE

Other operating  revenue increased $11.3 million compared with the first quarter
of last year due primarily to an $11.0 million  increase in fees and  commission
revenue.  Diversified  sources of fees and commission  revenue are a significant
part of our business  strategy and represented  43% of total revenue,  excluding
gains and  losses on asset  sales,  securities  and  derivatives,  for the first
quarter of 2006.  We believe  that a variety of fee  revenue  sources  provide a
stable source of income not affected by changes in interest rates, values in the
equity  markets,  commodity  prices and consumer  spending,  all of which can be
volatile. We expect continued growth in other operating revenue through offering
new products and services and by expanding into new markets. However,  increased
competition  and  saturation  in our existing  markets  could affect the rate of
future increases.

FEES AND COMMISSIONS REVENUE

Transaction  card revenue  increased $2.0 million or 12% in the first quarter of
2006 compared to the same period of the prior year. Check card revenue increased
$1.0 million or 29% while merchant discount fees increased $739 thousand or 13%.
Transaction volumes provided the increased revenue. Growth in check card revenue
was  distributed  among the Oklahoma,  New Mexico and Texas  markets.  Increased
merchant discount fees were centered primarily in Oklahoma.  ATM network revenue
also increased, up $217 thousand or 3% over the first quarter of 2005.

Trust fees and  commissions  increased $1.9 million or 12% for the first quarter
of 2006.  The fair  value of all trust  relationships,  which is the basis for a
significant portion of trust fees,  increased to $29.1 billion at March 31, 2006
compared  with $25.4 billion at March 31, 2005.  Revenue from the  management of
oil and gas  properties  increased  $509  thousand or 47% while  personal  trust
management fees increased $646 thousand or 13%. Trust activities in the Oklahoma
and Colorado markets provided $13.2 million and $2.4 million,  respectively,  of
total trust fees and commissions during the first quarter of 2006. Trust revenue
grew 10% in the Oklahoma  market and 36% in the Colorado  market,  respectively,
over the first quarter of 2005.

Brokerage and trading revenue increased $674 thousand or 6% in the first quarter
of 2006 compared to the same period of the prior year.  Customer hedging revenue
increased $2.3 million, or 189%, to $3.5 million. Volatility in the energy

 5

markets  prompted our energy  customers to more actively hedge their gas and oil
production.

Revenue from securities trading activities  decreased $1.7 million, or 25%. Much
of the decrease in trading revenue is attributed to increased competition in the
market for corporate  securities and lower demand caused by the flattening yield
curve. Revenue from retail brokerage activities increased $114 thousand,  or 4%,
over the same period of 2005.

Service charges on deposit accounts  increased $1.8 million or 8% over the first
quarter  of 2005.  Overdraft  fees  grew  $2.6  million  or 21%.  The  volume of
overdraft items processed increased over last year.  Additionally,  the per item
overdraft  charge was increased in the second quarter of 2005.  Account  service
charge  revenue  decreased  $760 thousand or 10%.  This  decrease  reflected the
change in  earnings  credit  available  to  commercial  deposit  customers.  The
earnings  credit,  which provides a non-cash method for commercial  customers to
avoid  incurring  charges for deposit  services,  increases  when interest rates
rise.

Mortgage banking revenue,  which is discussed more fully in the Line of Business
-  Mortgage  Banking  section  of this  report,  increased  $1.2  million or 22%
compared with 2005.  Net gains on mortgage  loans sold totaled $2.8 million,  up
$1.3  million over the first  quarter of 2005.  Servicing  revenue  totaled $4.0
million for the first  quarter of 2006,  down 3% from last year due to a 4 basis
point  decrease  in average  servicing  fee rates.  A change in the mix of loans
serviced for others decreased the average  servicing fee rate compared with last
year.

Other operating revenue included $2.5 million of fees earned on margin assets in
the first quarter of 2006 and $570 thousand in the first quarter of 2005. Margin
assets,  which are held primarily as part of the Company's customer  derivatives
programs,  averaged  $249 million for the first  quarter of 2006,  compared with
$129  million for the first  quarter of 2005.  The  increase  in average  margin
assets reflected growth in the fair value of liability  derivative contracts due
primarily  to increased  volatility  in energy  markets.  Fees earned on average
margin assets  increased from 1.79% in the first quarter of 2005 to 4.13% in the
first  quarter  of 2006.  Fee  rates  earned  on  margin  assets  are  generally
consistent with short-term interest rates.


SECURITIES AND DERIVATIVES

BOK Financial  recognized net losses of $1.2 million on securities for the first
quarter of 2006.  This included net losses of $1.9 million on securities held as
an economic hedge of mortgage servicing rights. As permitted by FAS 156, certain
specifically  identified  securities  held  as an  economic  hedge  of  mortgage
servicing rights were transferred from the available for sale  classification to
a new  classification  entitled  "Mortgage Trading  Securities" as of January 1,
2006. These securities had an aggregate fair value of $49 million and unrealized
gains of $52 thousand when transferred. The unrealized gain on these securities,
less deferred taxes, was recorded as an increase in retained  earnings as of the
beginning of the first quarter.  Mortgage trading securities are carried at fair
value with  changes in fair value  recognized  in earnings  as they  occur.  The
Company's use of securities as an economic hedge of mortgage servicing rights is
more fully discussed in the Line of Business - Mortgage  Banking section of this
report. During the first quarter of 2005, BOK Financial recognized net losses on
securities of $2.6 million,  including $2.4 million of losses on securities held
as an economic hedge of mortgage servicing rights.

Net losses on  derivatives  totaled $309 thousand for the first quarter of 2006,
compared with net gains of $778 thousand in 2005.  Net losses in 2006  consisted
entirely of fair value  adjustments of derivatives  used to manage interest rate
risk and  related  hedged  liabilities.  Net gains on  derivatives  in the first
quarter of 2005 included a gain of $283 thousand from fair value  adjustments of
derivative  contracts held as economic hedges of mortgage  servicing  rights and
$495 thousand of net gains from fair value  adjustments of  derivatives  used to
manage interest rate risk and related hedged liabilities.

 6


--------------------------------------------------------------------------------------------------------------------------
Table 2 - Other Operating Revenue
(In thousands)
                                                                         Three Months Ended
                                           -------------------------------------------------------------------------------
                                               March 31,       Dec. 31,        Sept. 30,        June 30,        March 31,
                                                 2006           2005             2005            2005             2005
                                           -------------------------------------------------------------------------------
                                                                                              
Brokerage and trading revenue               $   12,010     $   11,116       $   11,366      $   10,404       $   11,336
Transaction card revenue                        18,508         18,988           18,526          17,979           16,543
Trust fees and commissions                      17,945         16,536           16,376          16,259           16,016
Deposit service charges and fees                23,986         25,222           25,619          25,347           22,173
Mortgage banking revenue                         6,789          7,018            9,535           8,550            5,578
Other revenue                                   10,811         10,067           9,490           8,160            7,397
--------------------------------------------------------------------------------------------------------------------------
  Total fees and commissions                    90,049         88,947           90,912          86,699           79,043
--------------------------------------------------------------------------------------------------------------------------
Gain on sales of assets                            918             71               81           5,937              972
Gain (loss) on securities, net                  (1,221)        (1,780)          (4,744)          2,266           (2,637)
Gain (loss) on derivatives, net                   (309)           106              606            (311)             778
--------------------------------------------------------------------------------------------------------------------------
  Total other operating revenue             $   89,437     $   87,344       $   86,855      $   94,591       $   78,156
--------------------------------------------------------------------------------------------------------------------------


OTHER OPERATING EXPENSE

Other operating expense for the first quarter of 2006 totaled $117.4 million,  a
$15.2 million or 15% increase from 2005. This increase resulted primarily from a
$12.8 million increase in personnel expense.

PERSONNEL EXPENSE

Personnel  expense  totaled $71.2 million for the first quarter of 2006 compared
with $58.4 million for the first quarter of 2005. Regular  compensation  expense
totaled $44.0 million, a $5.5 million or 14% increase over 2005. The increase in
regular  compensation  expense  was due to an 8%  increase  in  average  regular
compensation  per  full-time  equivalent  employee  and a 6% increase in average
staffing.  Average  staffing  increased 12% in Colorado and 5% in both Texas and
Oklahoma.  In addition,  regular  compensation  expense for the first quarter of
2006  included  $755  thousand  for Bank of Arizona,  which was  acquired in the
second quarter of 2005.

Incentive  compensation  expense  includes the  recognized  costs of  cash-based
commissions,  bonus and incentive programs,  stock-based  compensation plans and
deferred compensation plans.  Stock-based compensation plans include both equity
and liability awards.

Incentive  compensation  expense  totaled $15.2 million for the first quarter of
2006, an increase of $6.4 million over 2005.  First quarter 2006 expense for the
Company's various cash-based  incentive programs totaled $12.6 million,  up $2.4
million over last year. These programs consist primarily of formula-based  plans
that determine incentive amounts based on pre-established criteria. Compensation
expense for  stock-based  compensation  plans totaled $2.6 million for the first
quarter  of 2006  compared  with a $1.5  million  credit  in 2005.  Compensation
expense  for  stock-based  compensation  plans  accounted  for as equity  awards
totaled $1.5 million in the first quarter of 2006, compared with $1.2 million in
the first quarter of 2005. Expense for equity awards is determined by an award's
grant-date  fair value and is not affected by  subsequent  changes in the market
value of BOK  Financial  common  stock.  Compensation  expense  for  stock-based
compensation plans accounted for as liability awards totaled $1.0 million in the
first quarter of 2006,  compared with a credit of $2.6 million in 2005.  Expense
for liability  awards is based on current fair value,  including  current period
changes due to the market value of BOK Financial common stock.

Employee benefit expenses increased $862 thousand, or 8%, to $12.0 million. This
increase was due primarily to payroll taxes.  Expenses for employee  medical and
other  insurance  increased  $231  thousand,  or 6%, while  employee  retirement
expenses increased $145 thousand,  or 5%. Benefit expenses for the first quarter
of  2006  included  $1.8  million  of  pension  expense.  This  expense  will be
substantially  reduced in future  periods  by the  curtailment  of pension  plan
benefits  effective April 1, 2006.  Management expects this expense reduction to
be largely offset by the cost of enhanced employee thrift plan benefits.

 7

DATA PROCESSING AND COMMUNICATIONS EXPENSE

Data  processing and  communication  expenses  increased  $1.9 million,  or 13%,
compared to 2005. This expense consists of two broad categories, data processing
systems and transaction  card  processing.  Transaction  card  processing  costs
increased $1.1 million,  or 19%,  consistent  with the growth rate in check card
and merchant  discount  revenue.  Data  processing  systems costs increased $844
thousand, or 9%, compared with the first quarter of 2005.

OTHER OPERATING EXPENSES

Mortgage  banking expenses  decreased $526 thousand.  Costs associated with loan
origination and sales  activities  totaled $362 thousand in the first quarter of
2006 and $435 thousand in the first quarter of 2005.  Mortgage  banking  expense
also  includes  changes in the fair value of  mortgage  servicing  rights due to
runoff  of the  underlying  loans.  Fair  value  of  mortgage  servicing  rights
decreased  $2.7  million  in the  first  quarter  of 2006  due to  loan  runoff.
Amortization  expense,  which also  considers  the runoff of  underlying  loans,
totaled $3.2 million in the first quarter of 2005. Additionally, other operating
expenses  were  reduced by $7.1  million  in the first  quarter of 2006 and $5.6
million  in the first  quarter  of 2005 due to  increases  in the fair  value of
mortgage  servicing rights.  These expenses are discussed more fully in the Line
of Business - Mortgage Banking section of this report.


----------------------------------------------------------------------------------------------------------------------
Table 3 - Other Operating Expense
(In thousands)
                                                                   Three Months Ended
                                   ----------------------------------------------------------------------------------
                                      March 31,        Dec. 31,       Sept. 30,         June 30,         March 31,
                                        2006             2005           2005              2005             2005
                                   ----------------------------------------------------------------------------------
                                                                                      
Personnel                          $    71,232     $    68,666     $    66,533      $    65,333      $    58,439
Business promotion                       4,803           5,170           4,494            3,870            4,430
Professional fees and services           3,914           4,534           3,951            4,492            3,619
Net occupancy and equipment             13,026          12,864          12,587           12,650           12,094
Data processing & communications        16,995          18,054          17,492           16,381           15,099
Printing, postage and supplies           3,905           3,976           3,846            3,629            3,615
Net (gains) losses and operating
   expenses of repossessed assets          219             335            (387)             316              308
Amortization of intangible assets        1,370           1,797           1,801            1,808            1,537
Mortgage banking costs                   3,087           3,294           4,268            3,387            3,613
Change in fair value of mortgage
  servicing rights                      (7,081)              -               -                -                -
Provision (recovery) for impairment
  of mortgage servicing rights               -            (708)         (4,671)           7,088           (5,624)
Other expense                            5,909           5,921           7,120            7,056            5,029
---------------------------------------------------------------------------------------------------------------------
  Total other operating expense    $   117,379     $   123,903     $   117,034      $   126,010      $   102,159
---------------------------------------------------------------------------------------------------------------------


INCOME TAXES

Income tax expense was $31.2 million,  compared with $29.5 million for the first
quarter of 2005. This represented 36% of book taxable income for both periods.

LINES OF BUSINESS

BOK Financial  operates five  principal  lines of business:  Oklahoma  corporate
banking,  Oklahoma consumer banking,  mortgage banking,  wealth management,  and
regional  banking.  Mortgage  banking  activities  include loan  origination and
servicing across all markets served by the Company.  Wealth management  provides
brokerage  and  trading,  private  financial  services and  investment  advisory
services in all  markets.  It also  provides  fiduciary  services in all markets
except  Colorado.  Fiduciary  services  in  Colorado  are  included  in regional
banking.  Regional banking consists  primarily of corporate and consumer banking
activities  in the  respective  local  markets.  In  addition  to its  lines  of
business, BOK Financial has a funds management unit. The primary purpose of this
unit is to manage the Company's  overall liquidity needs and interest rate risk.
Each  line of  business  borrows  funds  from and  provides  funds to the  funds
management unit

 8

as needed to support their operations.

BOK Financial  allocates  resources and  evaluates  performance  of its lines of
business after allocation of funds, certain indirect expenses, taxes and capital
costs.  The  cost of  funds  borrowed  from  the  funds  management  unit by the
operating lines of business is transfer priced at rates that approximate  market
for funds with similar  duration.  Market is generally  based on the  applicable
LIBOR or interest rate swap rates,  adjusted for prepayment risk. This method of
transfer-pricing  funds that support  assets of the operating  lines of business
tends to insulate them from interest rate risk.

The value of funds  provided  by the  operating  lines of  business to the funds
management  unit is based on  applicable  Federal Home Loan Bank advance  rates.
Deposit accounts with indeterminate maturities,  such as demand deposit accounts
and  interest-bearing  transaction  accounts,  are  transfer-priced at a rolling
average based on expected duration of the accounts. The expected duration ranges
from 90 days for certain rate-sensitive deposits to five years.

Economic capital is assigned to the business units by a capital allocation model
that reflects management's  assessment of risk. This model assigns capital based
upon credit,  operating,  interest rate and market risk inherent in our business
lines and recognizes the diversification  benefits among the units. The level of
assigned  economic  capital is a combination  of the risk taken by each business
line, based on its actual exposures and calibrated to its own loss history where
possible.  Additional  capital  is  assigned  to the  regional  banking  line of
business based on our investment in those entities.

Consolidated  net income  provided  by the  Regional  Banking  and the  Oklahoma
Corporate Banking  Divisions  continued to increase due largely to asset growth.
Also, performance by business units that generate deposits for the Company, such
as the Oklahoma  consumer  banking  unit,  continued to improve due primarily to
internal funds pricing credits.  The increased value of deposits when short-term
interest rates are rising is reflected in the internal  transfer pricing credit.
The increase in internal  transfer  pricing  credit is offset  through the funds
management unit.

---------------------------------------------------------------------------
Table 4 - Net Income by Line of Business
(In thousands)                                Three months ended March 31,
                                                   2006             2005
                                             ------------------------------
Regional banking                              $  22,769       $   17,349
Oklahoma corporate banking                       18,635           15,345
Mortgage banking                                  3,237            2,257
Oklahoma consumer banking                         8,033            4,318
Wealth management                                 6,760            6,102
Funds management and other                       (4,686)           6,684
---------------------------------------------------------------------------
     Total                                     $ 54,748         $ 52,055
---------------------------------------------------------------------------

OKLAHOMA CORPORATE BANKING

The Oklahoma  Corporate  Banking Division  provides loan and lease financing and
treasury and cash  management  services to  businesses  throughout  Oklahoma and
certain  relationships in surrounding states. In addition to serving the banking
needs of small  businesses,  middle  market and larger  customers,  the Oklahoma
Corporate  Banking  Division has specialized  groups that serve customers in the
energy,  agriculture,  healthcare and banking/finance  industries,  and includes
TransFund, our electronic funds transfer network. The Oklahoma Corporate Banking
Division  contributed  $18.6 million or 34% to  consolidated  net income for the
first quarter of 2006. This compares to $15.3 million or 29% of consolidated net
income for 2005.  Growth in net income  provided by this division came primarily
from loan growth.  Average loans  attributed to the Oklahoma  Corporate  Banking
Division  were $4.1 billion for the first  quarter of 2006,  compared  with $3.6
billion  for the first  quarter of 2005.  Net loans  charged  off  totaled  $364
thousand for the first quarter of 2006, compared with $397 thousand in the first
quarter  of 2005.  Growth in other  operating  revenue  was due  largely to fees
earned on margin assets.

 9

Table 5 -  Oklahoma Corporate Banking
 (Dollars in Thousands)

                                      Three months ended March 31,
                                   ----------------------------------
                                          2006              2005
                                      -------------------------------
Net interest revenue               $      35,359     $      31,966

Other operating revenue                   23,543            20,366
Operating expense                         28,039            26,821
Net loans charged off                        364               397
Net income                                18,635            15,345

Average assets                     $   5,318,039     $   4,535,152
Average economic capital                 372,270           289,480

Return on assets                             1.42%           1.37%
Return on economic capital                  20.30%          21.50%
Efficiency ratio                            47.60%          51.25%


OKLAHOMA CONSUMER BANKING

The Oklahoma Consumer Banking Division provides a full line of deposit, loan and
fee-based  services  to  customers   throughout   Oklahoma  through  four  major
distribution channels:  traditional branches,  supermarket branches, the 24-hour
ExpressBank  call  center and the  Internet.  Additionally,  the  division  is a
significant  referral  source for the Bank of Oklahoma  Mortgage  Division ("BOk
Mortgage") and BOSC's retail brokerage  division.  The Consumer Banking Division
contributed $8.0 million or 15% to consolidated net income for the first quarter
of 2006.  This  compares to $4.3  million or 8% of  consolidated  net income for
2005. Average deposits attributed to this Division increased $182 million, or 7%
compared with last year. The value to the Company of these lower-costing  retail
deposits  continues to increase as  short-term  interest  rates rise.  Operating
revenue  increased  $2.5  million  or 17% over last year due  largely  to a $1.7
million increase in deposit fees and overdraft charges.


Table 6 -  Oklahoma Consumer Banking
 (Dollars in Thousands)

                                     Three months ended March 31,
                                  ----------------------------------
                                         2006              2005
                                     -------------------------------
Net interest revenue              $      16,095     $      12,186

Other operating revenue                  17,255            14,713
Operating expense                        19,529            18,989
Net loans charged off                       722               784
Net income                                8,033             4,318

Average assets                    $   2,951,359     $   2,872,501
Average economic capital                 69,670            69,360

Return on assets                            1.10%           0.61%
Return on economic capital                 46.76%          25.25%
Efficiency ratio                           58.56%          70.59%


MORTGAGE BANKING

BOK Financial  engages in mortgage banking  activities  through the BOk Mortgage
Division  of  Bank  of  Oklahoma.  These  activities  include  the  origination,
marketing and servicing of conventional and government-sponsored mortgage loans.
Consolidated  mortgage  banking  revenue,  which is included in other  operating
revenue,  increased $1.2 million or 22% compared with the first quarter of 2005.
Mortgage banking  activities  contributed $3.2 million or 6% to consolidated net
income in the first quarter of 2006, compared with $2.3 million or 4% in 2005.

Mortgage  banking  activities  consist of two sectors,  loan production and loan
servicing.  The loan  production  sector  generally  performs best when mortgage
rates are relatively low and loan origination volumes are high. Conversely, the

 10

loan servicing sector generally performs best when mortgage rates are relatively
high and  prepayments are low. The general trend has been toward higher mortgage
loan commitment rates, especially in the first quarter of 2006.

LOAN PRODUCTION SECTOR

Loan  production  revenue  totaled $3.0  million for the first  quarter of 2006,
including  $2.8  million  of  capitalized  mortgage  servicing  rights  and $158
thousand  of net gains on loans  sold.  Loan  production  revenue  totaled  $1.5
million for the first  quarter of 2005,  including  $2.0 million of  capitalized
mortgage  servicing rights.  The increase in loan production  revenue was due to
production  volume.  Mortgage  loans funded in the first quarter of 2006 totaled
$183 million,  including $168 million of loans funded for resale and $15 million
of loans funded for retention by  affiliates.  Mortgage loans funded in the same
period of 2005 totaled $175 million,  including $117 million of loans funded for
resale and $57 million of loans funded for retention by affiliates. The decrease
in loans funded for retention by affiliates was due primarily to increased sales
of community  development loans in the secondary  market.  The Company generally
retains the rights to service these loans. Approximately 70% of the loans funded
during the first quarter of 2006 were to borrowers in Oklahoma.  Loan production
activities resulted in net pre-tax income of $160 thousand for the first quarter
of 2006 and a net pre-tax loss of $138  thousand for the first  quarter of 2005.
The  pipeline of mortgage  loan  applications  totaled $268 million at March 31,
2006,  compared to $233  million at December  31, 2005 and $250 million at March
31, 2005.

LOAN SERVICING SECTOR

The loan  servicing  sector had  pre-tax  income of $5.5  million  for the first
quarter of 2006  compared to pre-tax  income of $3.4 million for the same period
of 2005.  The fair value of  mortgage  servicing  rights  increased  during both
periods due to rising mortgage commitment rates and related market factors.

A 28 basis point increase in average  mortgage  commitment  rates since December
31, 2005 resulted in a $7.1 million  increase in the value of servicing  rights.
Rising  mortgage  commitment  rates,  along with other market  factors,  reduced
anticipated  prepayment speeds and decreased the discount rate used to value the
servicing rights. As previously noted, the Company adopted the fair value method
of accounting for mortgage  servicing  rights  permitted by FAS 156. By adopting
FAS 156 in the  first  quarter  of 2006,  the  Company  was  permitted  to fully
recognize this appreciation. Recognition would have been limited to $4.2 million
of the increase in fair value under the  previously  required  "lower of cost or
fair value"  accounting  standard.  Losses of $1.9 million were  recognized from
decreases in the fair value of financial  instruments  held as an economic hedge
of the value of the servicing rights.

During the first  quarter of 2005,  the  allowance  for  impairment  of mortgage
servicing  rights was  reduced by $5.6  million  due to an  increase in the fair
value of the  servicing  rights.  The  reduction in the  allowance was partially
offset  by net  losses  of $2.1  million  recognized  on  financial  instruments
designated as an economic hedge.

Servicing  revenue,  which  is  included  in  mortgage  banking  revenue  on the
Consolidated  Statements of Earnings,  totaled $4.0 million in the first quarter
of 2006  compared with $4.1 million in 2005.  The decrease in servicing  revenue
reflected a decrease in  servicing  rates.  The average  outstanding  balance of
loans  serviced for others was $4.0 billion during 2006 compared to $3.8 billion
during  2005.  However,   annualized  servicing  revenue  per  outstanding  loan
principal  decreased to 40 basis points for the first quarter of 2006,  compared
with 44 basis points last year.  Increased  servicing  of community  development
loans  and  certain  government-sponsored  loans  caused  the  decrease  in  the
servicing  fee rates.  Servicing  fees on both of these loan types are less than
the portfolio average servicing fee rate.

On March 31, 2006,  the Company paid  approximately  $6.8 million to acquire the
rights to service  approximately  $480 million of mortgage loans.  Substantially
all of these loans are to borrowers in our primary market areas.

The fair value of mortgage  servicing  rights  decreased $2.7 million during the
first  quarter  of 2006 due to runoff of the  underlying  loans  serviced.  This
reduction  in  fair  value  is  included  in  mortgage   banking  costs  in  the
Consolidated Statements of Earnings.  Prior to the adoption of FAS 156, mortgage
servicing  rights were  amortized in proportion to projected cash flows over the
estimated  life of the loans  serviced.  Projected  cash flows  considered  both
actual and  estimated  runoff of the  underlying  loans  serviced.  Amortization
expense  recognized  in mortgage  banking costs during the first quarter of 2005
totaled $3.2  million.  The  decrease in expense  related to the runoff of loans
serviced primarily reflects lower loan prepayment speeds.

 11

Table 7 -  Mortgage Banking
 (Dollars in Thousands)
                                            Three months ended March 31,
                                     ---------------------------------------
                                                 2006             2005
                                      --------------------------------------
Net interest revenue                      $         547    $       1,430

Capitalized mortgage servicing rights             2,835            1,981
Other operating revenue                           4,363            4,447
Operating expense                                 7,669            7,711
Change in fair value of mortgage
   servicing rights                              (7,081)               -
Recovery for impairment of mortgage
   servicing rights                                   -           (5,624)
Losses on financial instruments, net             (1,861)          (2,076)
Net income                                        3,237            2,257

Average assets                            $     446,434    $     515,648
Average economic capital                         23,070           23,300

Return on assets                                    2.94%           1.78%
Return on economic capital                         56.90%          39.29%
Efficiency ratio                                   99.02%          98.13%


BOK Financial  designates a portion of its  securities  portfolio as an economic
hedge against the risk of loss on its mortgage servicing rights. Mortgage-backed
securities  and U.S.  government  agency  debentures are designated as "mortgage
trading  securities" when prepayment risks exceed certain levels.  Additionally,
interest rate  derivative  contracts may also be designated as an economic hedge
of the risk of loss on  mortgage  servicing  rights.  Because the fair values of
these  instruments  are  expected  to vary  inversely  to the fair  value of the
servicing  rights,  they are expected to partially  offset risk. These financial
instruments  are  carried at fair  value.  Beginning  January 1, 2006,  with the
adoption  of FAS 156,  changes in fair value are  recognized  in current  period
income.  No special  hedge  accounting  treatment  is  applicable  to either the
mortgage servicing rights or the financial instruments designated as an economic
hedge.

The Company's hedging strategy  presents certain risks. A well-developed  market
determines the fair value for the securities and derivatives.  However, there is
no comparable  market for mortgage  servicing  rights.  Therefore,  the computed
change in value of the servicing rights for a specified change in interest rates
may not correlate to the change in value of the securities.

At March 31, 2006,  financial  instruments with a fair value of $65 million were
held for the economic  hedge  program.  The  interest  rate  sensitivity  of the
mortgage servicing rights and securities held as a hedge is modeled over a range
of +/- 50 basis points.  At March 31, 2006, the pre-tax results of this modeling
on reported earnings were:


Table 8 - Interest Rate Sensitivity - Mortgage Servicing
(Dollars in Thousands)
                                           50 bp increase   50 bp decrease
                                          ----------------- ----------------
Anticipated change in:
Fair value of mortgage servicing rights    $     2,663      $   (3,717)
Fair value of hedging instruments               (2,124)          2,326
                                          ----------------- ----------------
   Net                                     $       539      $   (1,391)
                                          ----------------- ----------------


Table 8 shows the non-linear  effect of changes in mortgage  commitment rates on
the value of mortgage  servicing  rights.  A 50 basis point increase in rates is
expected to increase  value by $2.7 million  while a 50 basis point  decrease is
expected to reduce value by $3.7 million.  This considers that there is an upper
limit to appreciation in the value of servicing  rights as rates rise due to the
contractual  repayment terms of the loans and other factors.  There is much less
of a limit on the speed at which  mortgage  loans may prepay in a declining rate
environment.

WEALTH MANAGEMENT

BOK  Financial  provides a wide range of financial  services  through its wealth
management line of business, including trust and private financial services, and
brokerage and trading activities.  This line of business includes the activities
of BOSC,  Inc.,  a  registered  broker /  dealer.  Trust and  private  financial
services includes sales of institutional, investment

 12

and  retirement  products,  loans and other  services to  affluent  individuals,
businesses,  not-for-profit  organizations,  and  governmental  agencies.  Trust
services are provided  primarily to clients throughout  Oklahoma,  Texas and New
Mexico.   Additionally,   trust  services  include  a  nationally   competitive,
self-directed  401-(k) program and  administrative  and advisory services to the
American  Performance  family of mutual funds.  Brokerage and trading activities
within the wealth  management line of business consist of retail sales of mutual
funds,   securities  and  annuities,   institutional  sales  of  securities  and
derivatives,  bond underwriting and other financial advisory services.  Customer
hedging programs are included in the Wealth Management Division.

Wealth Management contributed $6.8 million or 12% to consolidated net income for
the first quarter of 2006.  This compared to $6.1 million or 12% of consolidated
net income for 2005.

Trust and private  financial  services  provided  $5.5  million of net income in
2006,  an 18%  increase  over  2005.  At March  31,  2006 and 2005,  the  wealth
management  line of business was  responsible  for trust  assets with  aggregate
market values of $26.6 billion and $23.3  billion,  respectively,  under various
fiduciary  arrangements.  The growth in trust assets reflected  increased market
value of assets managed in addition to new business  generated  during the year.
We have sole or joint discretionary  authority over $9.5 billion of trust assets
at March 31, 2006, compared with $8.1 billion at March 31, 2005.

Brokerage  and trading  activities  provided $1.3 million of total net income in
the first  quarter of 2006  compared to $1.5 million  provided in same period of
2005.  Growth in net income from our customer  hedging  programs  was  partially
offset by a reduction in income from trading activities.


Table 9 -  Wealth Management
 (Dollars in Thousands)
                                          Three months ended March 31,
                                       ----------------------------------
                                              2006              2005
                                          -------------------------------
Net interest revenue                   $       8,265     $       5,823

Other operating revenue                       26,217            25,016
Operating expense                             23,262            20,755
Net income                                     6,760             6,102

Average assets                         $   1,723,255     $   1,380,557
Average economic capital                     120,880            99,590

Return on assets                                 1.59%           1.79%
Return on economic capital                      22.68%          24.85%
Efficiency ratio                                67.46%          67.30%


REGIONAL BANKING

Regional  Banking  consists  primarily of the corporate and  commercial  banking
services  provided  by Bank of Texas,  Bank of  Albuquerque,  Bank of  Arkansas,
Colorado State Bank and Trust, and Bank of Arizona in their respective  markets.
They also include fiduciary  services provided by Colorado State Bank and Trust.
Small businesses and middle-market  corporations are Regional  Banking's primary
customer  focus.   Regional  Banking   contributed   $22.8  million  or  42%  to
consolidated  net income  during the first  quarter of 2006.  This compares with
$17.3  million or 33% of  consolidated  net income for the same  period in 2005.
Growth in net income  contributed  by the  regional  banks came  primarily  from
operations in Colorado.  Net income from Colorado was $3.5 million for the first
quarter of 2006,  compared  with $792  thousand for the same period of 2005.  In
addition, net income for 2006 in Texas and New Mexico increased $2.3 million, or
21%, and $805 thousand, or 18%, respectively.

Growth in net income from Texas operations resulted from a $4.0 million increase
in net interest revenue.  Average earning assets increased $418 million, or 15%,
from the first  quarter of 2005.  This  increase  resulted  from a $405  million
increase  in average  loans.  The growth in  average  earning  assets was funded
primarily  by a $93  million  increase  in average  demand  deposits  and a $265
million increase in average interest-bearing deposits.

The increase in net income from New Mexico  operations was also based largely on
a $1.1  million  increase  in  net  interest  revenue.  Average  earning  assets
decreased $132 million.  Average loans increased $59 million while funds sold to
the

 13

funds management unit decreased $184 million. Average deposits in the New Mexico
market increased $121 million, including $28 million of demand deposits. Average
funds borrowed from external sources decreased $313 million.

Net income from operations in Colorado was $3.6 million for the first quarter of
2006,  compared with $792  thousand for the first quarter of 2005.  Net interest
revenue  increased  $2.5 million due  primarily  to a $365  million  increase in
average earning assets.  Average loans increased $78 million while average funds
sold to the funds management unit increased $290 million.  The growth in earning
assets was funded  primarily  by a $286  million  increase  in  interest-bearing
deposits.  In addition to the effect of revenue growth on net income,  net loans
charged-off or recovered  decreased $1.7 million compared with the first quarter
of 2005.

We continue to expand  operations in the Arizona market since the acquisition of
Bank of Arizona in the second quarter of 2005.  Outstanding  loans attributed to
the Arizona market averaged $212 million for the first quarter of 2006, compared
with $92 million of loans acquired in April 2005.  Total deposits  averaged $108
million for the first quarter of 2006.


Table 10 -  Bank of Texas
 (Dollars in Thousands)
                                           Three months ended March 31,
                                        ----------------------------------
                                               2006              2005
                                           -------------------------------
Net interest revenue                    $      34,788     $      30,745

Other operating revenue                         6,130             5,233
Operating expense                              20,267            19,096
Net loans charged off                             286               118
Net income                                     13,236            10,917

Average assets                          $   3,545,820     $   3,128,687
Average economic capital                      218,430           164,660
Average invested capital                      385,510           331,740

Return on assets                                  1.51%           1.42%
Return on economic capital                       24.58%          26.89%
Return on average invested capital               13.92%          13.35%
Efficiency ratio                                 49.53%          53.08%


Table 11 -  Bank of Albuquerque
 (Dollars in Thousands)
                                          Three months ended March 31,
                                       ----------------------------------
                                              2006              2005
                                          -------------------------------
Net interest revenue                   $      11,749     $      10,680

Other operating revenue                        3,930             3,358
Operating expense                              7,112             6,759
Net loans charged off                            110               144
Net income                                     5,167             4,362

Average assets                         $   1,472,394     $   1,605,665
Average economic capital                      76,570            81,420
Average invested capital                      95,660           100,510

Return on assets                                 1.42%           1.10%
Return on economic capital                      27.37%          21.73%
Return on average invested capital              21.91%          17.60%
Efficiency ratio                                45.36%          48.15%

 14

Table 12 - Bank of Arkansas
 (Dollars in Thousands)
                                          Three months ended March 31,
                                       ----------------------------------
                                              2006              2005
                                          -------------------------------
Net interest revenue                   $       1,543     $       2,186

Other operating revenue                        2,812             3,112
Operating expense                              2,949             3,197
Net loans charged off                            (10)               10
Net income                                       865             1,278

Average assets                         $     198,741     $     258,695
Average economic capital                      13,490            11,170
Average invested capital                      13,490            11,170

Return on assets                                 1.77%           2.00%
Return on economic capital                      26.00%          46.40%
Return on average invested capital              26.00%          46.40%
Efficiency ratio                                67.72%          60.34%


Table 13 - Colorado State Bank and Trust
 (Dollars in Thousands)
                                         Three months ended March 31,
                                      ----------------------------------
                                             2006              2005
                                         -------------------------------
Net interest revenue                  $       8,525     $       6,043

Other operating revenue                       3,035             4,028
Operating expense                             5,961             7,147
Net loans charged off                           (49)            1,628
Net income                                    3,451               792

Average assets                        $   1,037,770     $     668,653
Average economic capital                     60,560            41,040
Average invested capital                    102,540           83,030

Return on assets                                1.35%           0.48%
Return on economic capital                     23.11%           7.82%
Return on average invested capital             13.65%           3.87%
Efficiency ratio                               51.57%          70.97%


Table 14 - Bank of Arizona
 (Dollars in Thousands)
                                          Three months ended March 31,
                                       ----------------------------------
                                              2006              2005
                                          -------------------------------
Net interest revenue                       $  2,689          $  ***

Other operating revenue                         106             ***
Operating expense                             2,552             ***
Net loans charged off                             2             ***
Net income                                       50             ***

Average assets                           $  332,935          $  ***
Average economic capital                     16,940             ***
Average invested capital                     33,590             ***

Return on assets                               0.06%            ***
Return on economic capital                     1.20%            ***
Return on average invested capital             0.60%            ***
Efficiency ratio                              91.31%            ***

*** Data not applicable due to acquisition of Bank of Arizona in April 2005.

 15

FINANCIAL CONDITION

SECURITIES

Securities are classified as either held for  investment,  available for sale or
trading  based  upon  asset/liability   management  strategies,   liquidity  and
profitability  objectives and regulatory  requirements.  Investment  securities,
which consist  primarily of Oklahoma  municipal  bonds,  are carried at cost and
adjusted for amortization of premiums or accretion of discounts.  Management has
the ability and intent to hold these securities until they mature. Available for
sale securities, which may be sold prior to maturity, are carried at fair value.
Unrealized  gains or losses,  less deferred  taxes,  are recorded as accumulated
other  comprehensive  income in shareholders'  equity.  Certain  mortgage-backed
securities,  identified as mortgage trading securities,  have been designated as
economic hedges of mortgage  servicing  rights.  These securities are carried at
fair value with changes in fair value recognized in current period income. These
securities  are held with the intent that gains or losses will offset changes in
the fair value of  mortgage  servicing  rights.  The  Company  also  maintains a
separate trading securities portfolio.  Trading portfolio securities,  which are
also  carried  at fair value with  changes in fair value  recognized  in current
period income,  are acquired and held with the intent to sell at a profit to the
Company.

The amortized cost of available for sale securities totaled $4.9 billion at both
March 31, 2006 and December 31, 2005.  Mortgage-backed  securities  continued to
represent  substantially  all  available  for  sale  securities.  As  previously
discussed  in  the  Net  Interest  Revenue  section  of  this  report,  we  hold
mortgage-backed  securities as part of our overall interest rate risk management
strategy.

The primary  risk of holding  mortgage-backed  securities  comes from  extension
during periods of rising interest rates or prepayment  during periods of falling
interest  rates. We evaluate this risk through  extensive  modeling of risk both
before  making  an  investment  and  throughout  the life of the  security.  The
effective duration of the mortgage-backed securities portfolio was approximately
2.8 years at March 31, 2006 and at December 31, 2005.  Management estimates that
the effective duration of the mortgage-backed  securities portfolio would extend
to 3.1 years assuming a 300 basis point immediate rate shock.

Net unrealized  losses on available for sale securities  totaled $148 million at
March 31, 2006 compared with net  unrealized  losses of $105 million at December
31, 2005 due primarily to rising interest  rates.  The aggregate gross amount of
unrealized losses at March 31, 2006 totaled $157 million.  Management  evaluated
the securities with unrealized losses to determine if we believe that the losses
were  temporary.  This  evaluation  considered  factors  such as  causes  of the
unrealized  losses  and  prospects  for  recovery  over  various  interest  rate
scenarios and time periods.  We also considered our intent and ability to either
hold or sell the  securities.  It is  management's  belief,  based on  currently
available  information and our evaluation,  that the unrealized  losses in these
securities are temporary.

LOANS

The  aggregate  loan  portfolio at March 31, 2006 totaled  $9.2  billion,  a $62
million  increase  since  December 31, 2005.  Net loan growth  slowed during the
first quarter of 2006 due largely to payoffs in the energy and services  sectors
of the commercial loan portfolio.

 16


---------------------------------------------------------------------------------------------------------------------
Table 15 - Loans
(In thousands)
                                         March 31,        Dec. 31,       Sept. 30,        June 30,        March 31,
                                           2006             2005           2005             2005            2005
                                    ---------------------------------------------------------------------------------
Commercial:
                                                                                        
  Energy                             $   1,367,400    $   1,399,417   $   1,350,835   $   1,278,885    $   1,174,498
  Services                               1,358,194        1,425,821       1,419,342       1,340,411        1,263,527
  Wholesale/retail                         850,013          793,032         804,628         777,440          696,066
  Manufacturing                            519,100          514,792         484,662         483,211          468,615
  Healthcare                               534,091          520,309         476,616         434,132          441,651
  Agriculture                              284,277          291,858         238,950         244,687          263,382
  Other commercial and industrial          325,746          354,706         292,657         301,013          283,107
---------------------------------------------------------------------------------------------------------------------
      Total commercial                   5,238,821        5,299,935       5,067,690       4,859,779        4,590,846
---------------------------------------------------------------------------------------------------------------------

Commercial real estate:
  Construction and land development        686,400          638,366         605,457         542,049          518,137
  Multifamily                              205,755          204,620         225,074         237,904          224,533
  Other real estate loans                1,212,805        1,146,916       1,142,093       1,081,906          975,115
---------------------------------------------------------------------------------------------------------------------
      Total commercial real estate       2,104,960        1,989,902       1,972,624       1,861,859        1,717,785
---------------------------------------------------------------------------------------------------------------------

Residential mortgage:
  Secured by 1-4 family
    residential properties               1,177,337        1,169,331       1,166,559       1,151,674        1,215,022
  Residential mortgages held for sale       40,299           51,666          46,306          74,410           44,429
---------------------------------------------------------------------------------------------------------------------
      Total residential mortgage         1,217,636        1,220,997       1,212,865       1,226,084        1,259,451
---------------------------------------------------------------------------------------------------------------------

Consumer                                   640,542          629,144         630,389         566,958          517,884
---------------------------------------------------------------------------------------------------------------------

  Total                              $   9,201,959    $   9,139,978   $   8,883,568   $   8,514,680    $   8,085,966
---------------------------------------------------------------------------------------------------------------------


The commercial  loan portfolio  totaled $5.2 billion at March 31, 2006, down $61
million during the first quarter of 2006.  The services  sector of the portfolio
totaled $1.4 billion,  or 15% of the Company's total outstanding loans. Loans in
this sector of the portfolio  decreased $68 million since December 31, 2005. The
services  sector consists of a large number of loans to a variety of businesses,
including communications, gaming and transportation services. Approximately $981
million of the services sector is made up of loans with  individual  balances of
less than $10 million.  Energy loans totaled $1.4 billion or 15% of total loans.
Outstanding energy loans decreased $32 million,  or 4%, during the first quarter
of 2006.  Approximately $1.1 billion of loans in the energy portfolio was to oil
and gas producers.  The amount of credit available to these customers  generally
depends on a percentage  of the value of their proven energy  reserves  based on
anticipated  prices.  The  energy  category  also  included  loans to  borrowers
involved in the  transportation  and sale of oil and gas and to  borrowers  that
manufacture equipment or provide other services to the energy industry.

Other  notable loan  concentrations  by primary  industry of the  borrowers  are
presented in Table 15.

BOK Financial participates in shared national credits when appropriate to obtain
or maintain business relationships with local customers. Shared national credits
are defined by banking  regulators  as credits of more than $20 million and with
three or more  non-affiliated  banks as  participants.  At  March  31,  2006 and
December 31, 2005,  the  outstanding  principal  balances of these loans totaled
$1.2 billion and $1.1 billion,  respectively.  Substantially  all of these loans
were to borrowers with local market  relationships.  BOK Financial serves as the
agent  lender in  approximately  32% of the shared  national  credits,  based on
dollars committed. The Company's lending policies generally avoid loans in which
we  do  not  have  the   opportunity  to  maintain  or  achieve  other  business
relationships with the customer.

Commercial  real estate loans totaled $2.1 billion or 23% of the loan  portfolio
at March 31,  2006.  The  outstanding  balance of  commercial  real estate loans
increased $115 million,  or 6%, since December 31, 2005.  Commercial real estate
loans grew  primarily in the Oklahoma and Texas markets.  Construction  and land
development  loans included $536 million for single family  residential lots and
premises,  up $43 million,  or 9%, since December 31, 2005. The major components
of other  commercial real estate loans were office  buildings - $493 million and
retail facilities - $334 million. Commercial real estate loans secured by retail
facilities increased $28 million, or 9%, during the quarter.

Residential  mortgage loans,  excluding  mortgage loans held for sale,  included
$352  million of home  equity  loans,  $383  million of loans held for  business
relationship  purposes,  $236  million of  adjustable  rate  mortgages  and $185
million of loans held for community  development.  Consumer  loans included $370
million of indirect automobile loans, up $13

 17

million since  December 31, 2005.  While  substantially  all of these loans were
purchased  from dealers in Oklahoma,  most of the current  quarter's  growth was
from activities in Arkansas.

Table 16  presents  the  distribution  of the major  loan  categories  among our
primary market areas.


---------------------------------------------------------------------------------------------------------------------
Table 16 - Loans by Principal Market Area
(In thousands)

                                         March 31,        Dec. 31,       Sept. 30,        June 30,        March 31,
                                           2006             2005           2005             2005            2005
                                    ---------------------------------------------------------------------------------
Oklahoma:
                                                                                        
   Commercial                        $   3,074,406    $   3,159,683   $   3,101,209   $   3,026,311    $   2,871,566
   Commercial real estate                  936,030          862,700         890,737         856,617          791,816
   Residential mortgage                    847,848          842,757         839,344         827,431          936,375
   Residential mortgage held for sale       40,299           51,666          46,306          74,410           44,429
   Consumer                                468,920          466,180         472,899         425,318          389,571
                                    ---------------------------------------------------------------------------------
     Total Oklahoma                  $   5,367,503    $   5,382,986   $   5,350,495   $   5,210,087    $   5,033,757
                                    ---------------------------------------------------------------------------------
Texas:
   Commercial                        $   1,420,860    $   1,356,611   $   1,294,606   $   1,182,307    $   1,135,509
   Commercial real estate                  604,413          569,921         537,576         509,472          477,487
   Residential mortgage                    200,957          199,726         196,593         196,457          177,919
   Consumer                                 87,669           89,017          89,329          90,245           85,626
                                    ---------------------------------------------------------------------------------
     Total Texas                     $   2,313,899    $   2,215,275   $   2,118,104   $   1,978,481    $   1,876,541
                                    ---------------------------------------------------------------------------------
New Mexico:
   Commercial                        $     348,930    $     383,325   $     354,087   $     340,378    $     325,069
   Commercial real estate                  228,955          232,564         223,236         219,175          218,357
   Residential mortgage                     68,810           65,784          65,203          63,821           62,015
   Consumer                                 13,820           15,137          15,195          15,813           12,306
                                    ---------------------------------------------------------------------------------
     Total Albuquerque               $     660,515    $     696,810   $     657,721   $     639,187    $     617,747
                                    ---------------------------------------------------------------------------------
Arkansas:
   Commercial                        $      74,423    $      79,719   $      54,703   $      54,703    $      51,026
   Commercial real estate                   80,529           75,483          85,600          76,803           75,024
   Residential mortgage                     13,069           13,044          12,097          11,674           10,771
   Consumer                                 33,548           25,659          20,397           4,560            3,599
                                     ---------------------------------------------------------------------------------
     Total Northwest Arkansas        $     201,569    $     193,905   $     172,797   $     147,740    $     140,420
                                    ---------------------------------------------------------------------------------
Colorado:
   Commercial                        $     267,928    $     270,108   $     219,208   $     210,142    $     207,676
   Commercial real estate                  134,771          133,537         132,741         125,120          120,844
   Residential mortgage                     20,383           21,918          26,186          27,292           27,942
   Consumer                                 31,487           27,871          26,126          27,996           26,782
                                    ---------------------------------------------------------------------------------
     Total Colorado                  $     454,569    $     453,434   $     404,261   $     390,550    $     383,244
                                    ---------------------------------------------------------------------------------
Arizona:
   Commercial                        $      52,274    $      50,489   $      43,877   $      45,938    $           -
   Commercial real estate                  120,262          115,697         102,734          74,672           34,257
   Residential mortgage                     26,270           26,102          27,136          24,999                -
   Consumer                                  5,098            5,280           6,443           3,026                -
                                    ---------------------------------------------------------------------------------
     Total Arizona                   $     203,904    $     197,568   $     180,190   $     148,635    $      34,257
                                    ---------------------------------------------------------------------------------
Total BOK Financial loans            $   9,201,959    $   9,139,978   $   8,883,568   $   8,514,680    $   8,085,966
                                    ---------------------------------------------------------------------------------


 18

LOAN COMMITMENTS

BOK Financial enters into certain  off-balance sheet  arrangements in the normal
course of business.  These arrangements  included loan commitments which totaled
$4.7 billion and standby  letters of credit which  totaled $495 million at March
31, 2006. Loan commitments may be unconditional obligations to provide financing
or conditional  obligations that depend on the borrower's  financial  condition,
collateral value or other factors.  Standby letters of credit are  unconditional
commitments to guarantee the performance of our customer to a third party. Since
some of these  commitments  are expected to expire before being drawn upon,  the
total commitment amounts do not necessarily represent future cash requirements.

DERIVATIVES WITH CREDIT RISK

BOK Financial  offers programs that permit its customers to hedge various risks,
including  fluctuations in energy and cattle prices,  interest rates and foreign
exchange  rates,  or to take  positions in derivative  contracts.  Each of these
programs  work  essentially  the same way.  Derivative  contracts  are  executed
between the  customers  and BOK  Financial.  Offsetting  contracts  are executed
between the Company and  selected  counterparties  to minimize the risk to us of
changes in commodity  prices,  interest  rates, or foreign  exchange rates.  The
counterparty  contracts  are identical to the customer  contracts,  except for a
fixed  pricing  spread or a fee paid to us as  compensation  for  administrative
costs, credit risk and profit.

These  programs  create credit risk for  potential  amounts due to BOK Financial
from  its  customers  and  from  the  counterparties.  Customer  credit  risk is
monitored  through  existing  credit  policies  and  procedures.  The effects of
changes  in  commodity  prices,  interest  rates or foreign  exchange  rates are
evaluated  across a range of possible  options to determine the maximum exposure
we are  willing to have  individually  to any  customer.  Customers  may also be
required to provide margin collateral to further limit our credit risk.

Counterparty  credit risk is evaluated through existing policies and procedures.
This evaluation  considers the total relationship between BOK Financial and each
of the counterparties. Individual limits are established by management, approved
by Credit Administration and reviewed by the Asset / Liability Committee. Margin
collateral is required if the exposure  between the Company and any counterparty
exceeds  established  limits.  Based on declines in the  counterparties'  credit
rating, these limits are reduced and additional margin collateral is required.

A  deterioration  of the  credit  standing  of one or more of the  customers  or
counterparties to these contracts may result in BOK Financial recognizing a loss
as the fair value of the  affected  contracts  may no longer move in tandem with
the  offsetting  contracts.  This  could  occur if the  credit  standing  of the
customer  or  counterparty  deteriorated  such  that  either  the fair  value of
underlying  collateral no longer  supported  the contract or the  counterparty's
ability to provide margin collateral was impaired.

Derivative  contracts  are carried at fair value.  At March 31,  2006,  the fair
value of derivative  contracts  reported as assets under these programs  totaled
$401 million.  This included energy  contracts with fair values of $358 million,
interest  rate  contracts  with fair values of $32 million and foreign  exchange
contracts  with  fair  values  of $10  million.  The  aggregate  fair  values of
derivative  contracts reported as liabilities  totaled $402 million. At December
31,  2005,  the fair  values of assets  and  liabilities  reported  under  these
programs totaled $453 million and $452 million, respectively.  Approximately 94%
of the fair value of asset  contracts  was with  customers.  The credit  risk of
these contracts is generally backed by energy  production.  The remaining 6% was
with  counterparties.  The  maximum  net  exposure  to any  single  customer  or
counterparty totaled $87 million.

SUMMARY OF LOAN LOSS EXPERIENCE

The reserve for loan losses, which is available to absorb losses inherent in the
loan  portfolio,  totaled  $104 million at March 31,  2006,  compared  with $104
million at December 31, 2005 and $109 million at March 31, 2005.  These  amounts
represented 1.14%,  1.14% and 1.35% of outstanding  loans,  excluding loans held
for sale, at March 31, 2006, December 31, 2005 and March 31, 2005, respectively.
Losses on loans  held for  sale,  principally  mortgage  loans  accumulated  for
placement into security pools, are charged to earnings through adjustment in the
carrying  value.  The  reserve  for loan  losses  also  represented  323% of the
outstanding balance of nonperforming loans at March 31, 2006, compared with 413%
at December 31, 2005 and 219% at March 31, 2005. Nonperforming loans totaled $32
million at March 31,  2006,  compared  with $25 million at December 31, 2005 and
$50 million at March 31, 2005. Net loans charged off during the first quarter of
2006 totaled $1.6 million, down from $7.4 million in the fourth quarter of 2005

 19

and $3.2 million for the first quarter of 2005.  Net consumer loans charged off,
which  includes  deposit  overdraft  losses,  totaled $1.1 million for the first
quarter of 2006.

The Company considers credit risk from loan commitments and letters of credit in
its  evaluation  of the  adequacy  of the reserve  for loan  losses.  A separate
reserve for off-balance  sheet credit risk is maintained.  Table 17 presents the
trend of reserves  for  off-balance  sheet  credit  losses and the  relationship
between the reserve and loan commitments.  The relationship between the combined
reserve for credit losses and outstanding  loans is also presented to facilitate
comparison  with peer  banks and  others  who have not  adopted  this  preferred
presentation.  The provision for credit losses  included the combined  charge to
expense for both the  reserve  for loan  losses and the reserve for  off-balance
sheet credit losses. All losses incurred from lending activities will ultimately
be reflected in charge-offs  against the reserve for loan losses following funds
advanced against outstanding  commitments and after the exhaustion of collection
efforts.  The reserve for off-balance sheet credit losses would decrease and the
reserve for loan losses would increase as outstanding commitments are funded.


------------------------------------------------------------------------------------------------------------------------------
Table 17 - Summary of Loan Loss Experience
(In thousands)
                                                                           Three Months Ended
                                            ----------------------------------------------------------------------------------
                                                 March 31,        Dec. 31,       Sept. 30,        June 30,        March 31,
                                                   2006             2005           2005            2005             2005
                                            ----------------------------------------------------------------------------------
Reserve for loan losses:
                                                                                               
Beginning balance                           $     103,876     $     109,621   $     108,884  $     108,958    $     108,618
   Loans charged off:
      Commercial                                    1,242             5,772             819          1,641            1,438
      Commercial real estate                            -                84             730             90            1,715
      Residential mortgage                            207               226             382            423              181
      Consumer                                      2,700             3,497           3,380          2,890            2,490
------------------------------------------------------------------------------------------------------------------------------
      Total                                         4,149             9,579           5,311          5,044            5,824
------------------------------------------------------------------------------------------------------------------------------
   Recoveries of loans previously charged off:
      Commercial                                      847               826             711          1,435            1,099
      Commercial real estate                           40                 8               7             73               29
      Residential mortgage                             97               133              21             16               10
      Consumer                                      1,580             1,197           1,238          1,233            1,508
------------------------------------------------------------------------------------------------------------------------------
      Total                                         2,564             2,164           1,977          2,757            2,646
------------------------------------------------------------------------------------------------------------------------------
Net loans charged off                               1,585             7,415           3,334          2,287            3,178
Provision for loan losses                           1,852             1,670           4,071          1,142            3,518
Additions due to acquisitions                           -                 -               -          1,071                -
------------------------------------------------------------------------------------------------------------------------------
Ending balance                              $     104,143     $     103,876   $     109,621  $     108,884    $     108,958
------------------------------------------------------------------------------------------------------------------------------
Reserve for off-balance sheet credit losses:
Beginning balance                           $      20,574     $      17,794   $      17,889  $      16,984    $       18,502
Provision for off-balance sheet credit losses       1,548             2,780             (95)           873            (1,518)
Additions due to acquisitions                           -                 -               -             32                 -
------------------------------------------------------------------------------------------------------------------------------
Ending balance                              $      22,122     $      20,574   $      17,794  $      17,889    $       16,984
------------------------------------------------------------------------------------------------------------------------------
Total provision for credit losses           $       3,400     $       4,450   $       3,976  $       2,015    $        2,000
------------------------------------------------------------------------------------------------------------------------------
Reserve for loan losses to loans
    outstanding at period-end (1)                    1.14%             1.14%           1.24%          1.29%            1.35%
Net charge-offs (annualized)
    to average loans (1)                             0.07              0.33            0.16           0.11             0.16
Total provision for credit losses
    (annualized) to average loans (1)                0.15              0.20            0.19           0.10             0.10
Recoveries to gross charge-offs                     61.80             22.59           37.22          54.66            45.43
Reserve for loan losses as a multiple of
    net charge-offs (annualized)                    16.43x             3.50x           8.22x         11.90x            8.57x
Reserve for off-balance sheet credit
    losses to off-balance sheet credit commitments   0.36%             0.42%           0.41%          0.42%            0.41%
Combined reserves for credit losses to
    loans outstanding at period-end (1)              1.38              1.37            1.44           1.50             1.57
------------------------------------------------------------------------------------------------------------------------------
(1) Excludes residential mortgage loans held for sale.


Specific  impairment  reserves are  determined  through  evaluation of estimated
future cash flows and collateral value. At March 31, 2006,  specific  impairment
reserves  totaled $5.0 million on total impaired loans of $21 million.  Required
specific impairment reserves increased $2.3 million from December 31, 2005.

 20

Nonspecific  reserves are  maintained  for risks beyond  factors  specific to an
individual  loan or those  identified  through  migration  analysis.  A range of
potential  losses is determined  for each risk factor  identified.  At March 31,
2006, the ranges of potential losses for the more significant factors were:

General  economic  conditions - $6.4 million to $10.9 million  Concentration  in
large loans - $1.4 million to $2.9 million

The provision  for credit  losses  totaled $3.4 million for the first quarter of
2006, compared with $4.4 million for the fourth quarter of 2005 and $2.0 million
for the first quarter of 2005.  Factors  considered in determining the provision
for credit losses included increases in the outstanding  balances of classified,
criticized and  non-performing  loans.  These factors were  partially  offset by
decreases in the minimum reserve level for certain loan grades based on analysis
of long-term loss experience and by reductions in net losses.

NONPERFORMING ASSETS

Information  regarding  nonperforming assets, which totaled $40 million at March
31,  2006 and $34  million at  December  31,  2005,  is  presented  in Table 18.
Nonperforming  assets included  non-accrual  loans and excluded loans 90 days or
more past due but still accruing interest. Non-accrual loans totaled $32 million
at March 31,  2006 and $25  million  at  December  31,  2005.  Newly  identified
non-accruing  loans  totaled  $11  million  during  the first  quarter  of 2006.
Non-accruing loans decreased $1 million for loans charged off or foreclosed, and
$3 million for cash payments received.


---------------------------------------------------------------------------------------------------------------------
Table 18 - Nonperforming Assets
(In thousands)
                                                   March 31,      Dec. 31,     Sept. 30,    June 30,      March 31,
                                                     2006          2005          2005         2005          2005
                                               ----------------------------------------------------------------------
Nonaccrual loans:
                                                                                        
   Commercial                                   $    17,073   $    11,673   $    17,920  $    21,173   $    29,116
   Commercial real estate                             6,444         5,370        10,422       11,722        12,671
   Residential mortgage                               8,057         7,347         8,531        7,154         7,533
   Consumer                                             655           772           480          478           483
---------------------------------------------------------------------------------------------------------------------
   Total nonaccrual loans                            32,229        25,162        37,353       40,527        49,803
Other nonperforming assets                            8,196         8,476         5,069        5,062         3,187
---------------------------------------------------------------------------------------------------------------------
   Total nonperforming assets                   $    40,425   $    33,638   $    42,422  $    45,589   $    52,990
---------------------------------------------------------------------------------------------------------------------
Ratios:
 Reserve for loan losses to nonaccrual loans        323.13%       412.83%       293.48%      268.67%       218.78%
 Combined reserves for credit
    losses to nonaccrual loans                      391.77        494.60        341.11        312.81       252.88
 Nonaccrual loans to period-end loans (2)             0.35          0.28          0.42         0.48          0.62
---------------------------------------------------------------------------------------------------------------------
Loans past due (90 days)  (1)                  $     3,919   $     8,708    $   10,027   $    7,125   $     6,782
---------------------------------------------------------------------------------------------------------------------
(1)  Includes residential mortgages
     guaranteed by agencies of the U.S.
     Government.                               $     1,595   $     2,021   $     3,646  $     3,713   $     2,650
(2) Excludes residential mortgage loans held for sale.
---------------------------------------------------------------------------------------------------------------------


The loan review process also identified  loans that possess more than the normal
amount of risk due to deterioration  in the financial  condition of the borrower
or the value of the  collateral.  Because the borrowers are still  performing in
accordance  with  the  original  terms of the  loan  agreements,  and no loss of
principal  or  interest  is  anticipated,  these  loans  were  not  included  in
Nonperforming Assets. Known information,  however, causes management concerns as
to the  borrowers'  ability  to  comply  with  current  repayment  terms.  These
potential problem loans totaled $23 million at March 31, 2006 and $28 million at
December 31, 2005. The current composition of potential problem loans by primary
industry  included  healthcare  - $12  million,  services - $6 million  and real
estate - $3 million.

 21

DEPOSITS

Deposit accounts represent our primary funding source. We compete for retail and
commercial  deposits  by offering a broad range of  products  and  services  and
focusing on customer convenience. Retail deposit growth is supported through our
Perfect  Banking  program,  free  checking  and  on-line  Billpay  services,  an
extensive  network of branch  locations and ATMs and a 24-hour Express Bank call
center.  Commercial deposit growth is supported by offering treasury  management
and lockbox services.

Total  deposits  averaged  $11.1  billion for the first quarter of 2006, up $408
million,  or 4%,  compared with average  deposits in the fourth quarter of 2005.
The growth in average  deposits was driven by a $976  million  increase in total
deposits across all of our markets during the fourth quarter. Deposits continued
to grow in the New Mexico,  Colorado,  Arizona and Arkansas  markets  during the
first quarter of 2006. However,  following fourth quarter deposit growth of $471
million in  Oklahoma  and $418  million  in Texas,  deposits  decreased  by $153
million and $52 million, respectively, during the first quarter of 2006.

Average  core  deposits,  which we define  as  deposits  of less than  $100,000,
excluding public funds and brokered deposits, increased at an annualized rate of
4%. Average core deposits  comprised 49% of total deposits for the first quarter
of 2006, down from 50% for the preceding quarter. Deposit accounts with balances
in excess of $100,000  represented 41% and 40% of average deposits for the first
quarter of 2006 and the fourth quarter of 2005, respectively.


The distribution of deposit  accounts among principal  markets is shown in Table
19.

 22


---------------------------------------------------------------------------------------------------------------------
Table 19 - Deposits by Principal Market Area
(In thousands)
                                         March 31,        Dec. 31,       Sept. 30,        June 30,        March 31,
                                           2006            2005            2005             2005            2005
                                    ---------------------------------------------------------------------------------
Oklahoma:
                                                                                        
   Demand                            $     950,582   $   1,003,284    $     959,169   $   1,028,640    $   1,091,132
   Interest-bearing:
     Transaction                         2,937,228       3,002,610        2,411,175       2,367,511        2,235,950
     Savings                                93,093          85,837           86,220          89,972           93,655
     Time                                2,623,352       2,564,337        2,728,224       2,450,730        2,511,465
                                    ---------------------------------------------------------------------------------
   Total interest-bearing                5,653,673       5,652,784        5,225,619       4,908,213        4,841,070
                                    ---------------------------------------------------------------------------------
     Total Oklahoma                  $   6,604,255   $   6,656,068    $   6,184,788   $   5,936,853    $   5,932,202
                                    ---------------------------------------------------------------------------------
Texas:
   Demand                            $     551,411   $     615,732    $     533,475   $     478,855    $     628,043
   Interest-bearing:
     Transaction                         1,455,856       1,535,570        1,299,279       1,292,938        1,111,808
     Savings                                27,827          27,398           29,620          29,635           30,695
     Time                                  726,530         735,731          633,785         606,528          601,397
                                    ---------------------------------------------------------------------------------
   Total interest-bearing                2,210,213       2,298,699        1,962,684       1,929,101        1,743,900
                                    ---------------------------------------------------------------------------------
     Total Texas                     $   2,761,624   $   2,914,431    $   2,496,159   $   2,407,956    $   2,371,943
                                    ---------------------------------------------------------------------------------
New Mexico:
   Demand                            $     159,125   $     129,289    $     155,517   $     139,107    $     133,309
   Interest-bearing:
     Transaction                           408,160         381,099          338,706         306,230          314,067
     Savings                                17,805          17,839           17,614          17,875           18,428
     Time                                  483,428         453,314          454,561         449,180          434,131
                                    ---------------------------------------------------------------------------------
   Total interest-bearing                  909,393         852,252          810,881         773,285          766,626
                                    ---------------------------------------------------------------------------------
     Total New Mexico                $   1,068,518   $     981,541    $     966,398   $     912,392    $     899,935
                                    ---------------------------------------------------------------------------------
Arkansas:
   Demand                            $      11,629   $      10,429    $      13,772   $      10,890    $      14,922
   Interest-bearing:
     Transaction                            26,675          22,354           23,335          24,816           23,555
     Savings                                 1,051           1,058            1,268           1,284            1,405
     Time                                   73,082          75,034           81,510          83,388           88,031
                                    ---------------------------------------------------------------------------------
   Total interest-bearing                  100,808          98,446          106,113         109,488          112,991
                                    ---------------------------------------------------------------------------------
     Total Arkansas                  $     112,437   $     108,875    $     119,885   $     120,378    $     127,913
                                    ---------------------------------------------------------------------------------
Colorado:
   Demand                            $      56,419   $      61,647    $      51,978   $      32,044    $      73,383
   Interest-bearing:
     Transaction                           258,801         258,668          216,718         228,881          220,618
     Savings                                16,315          17,772           16,568          16,791           22,140
     Time                                  309,068         264,020          221,753         117,130           86,406
                                    ---------------------------------------------------------------------------------
   Total interest-bearing                  584,184         540,460          455,039         362,802          329,164
                                    ---------------------------------------------------------------------------------
     Total Colorado                  $     640,603   $     602,107    $     507,017   $     394,846    $     402,547
                                    ---------------------------------------------------------------------------------
Arizona:
   Demand                            $      55,421   $      45,567    $      42,784   $      60,412    $           -
   Interest-bearing:
     Transaction                            57,400          56,994           71,510          56,624                -
     Savings                                 3,380           4,111            3,862           4,771                -
     Time                                    4,608           5,624            6,802           6,574                -
                                    ---------------------------------------------------------------------------------
   Total interest-bearing                   65,388          66,729           82,174          67,969                -
                                    ---------------------------------------------------------------------------------
     Total Arizona                   $     120,809   $     112,296    $     124,958   $     128,381    $           -
                                    ---------------------------------------------------------------------------------
Total BOK Financial deposits         $  11,308,246   $  11,375,318    $  10,399,205   $   9,900,806    $   9,734,540
                                    ---------------------------------------------------------------------------------


 23

BORROWINGS AND CAPITAL

BOK Financial  (parent company) has a $100 million  unsecured  revolving line of
credit  with  certain  banks  that  expires  in  December  2010.  There  was  no
outstanding  principal  balance  on this  credit  agreement  at March 31,  2006.
Interest  is based on LIBOR  plus a defined  margin  that is  determined  by the
Company's  credit  rating or a base rate.  This  margin  ranges  from  0.375% to
1.125%.  The margin  currently  applicable  to  borrowings  against this line is
0.500%.  The base rate is defined as the greater of the daily federal funds rate
plus 0.500% or the SunTrust Bank prime rate. Interest is generally paid monthly.
Facility  fees are paid  quarterly on the unused  portion of the  commitment  at
rates that range from 0.100% to 0.250% based on the Company's credit rating.

This credit  agreement  includes  certain  restrictive  covenants that limit the
Company's  ability to borrow  additional  funds, to make  investments and to pay
cash dividends on common stock.  These  covenants also require BOK Financial and
subsidiary  banks to maintain  minimum  capital levels and to exceed minimum net
worth ratios.  BOK Financial met all of the  restrictive  covenants at March 31,
2006.

The primary source of liquidity for BOK Financial is dividends  from  subsidiary
banks,  which are limited by various  banking  regulations  to net  profits,  as
defined,  for the  preceding  two years.  Dividends  are further  restricted  by
minimum capital  requirements.  Based on the most restrictive  limitations,  the
subsidiary  banks  could  declare  up  to  $171  million  of  dividends  without
regulatory  approval.  Management  has  developed and the Board of Directors has
approved an internal capital policy that is more restrictive than the regulatory
capital  standards.  The subsidiary banks could declare  dividends of up to $105
million under this policy.

Equity capital for BOK Financial  increased $26 million to $1.6 billion at March
31,  2006.  Retained  earnings,  net income less cash  dividends,  provided  $48
million to this increase. Growth in capital from retained earnings was partially
offset by a $26 million increase in accumulated other  comprehensive  losses due
primarily  to net  unrealized  losses  on  available  for sale  securities.  The
remaining  increase  in  capital  during  the  first  quarter  of 2006  resulted
primarily from activity in employee stock options.

Capital is managed to  maximize  long-term  value to the  shareholders.  Factors
considered in managing  capital include  projections of future  earnings,  asset
growth  and   acquisition   strategies,   and   regulatory   and  debt  covenant
requirements.  Capital management may include subordinated debt issuance,  share
repurchase and stock and cash dividends.

On April 26, 2005, the Board of Directors authorized a share repurchase program,
which replaced a previously  authorized program. A maximum of two million common
shares may be repurchased.  The specific timing and amount of shares repurchased
will vary  based on market  conditions,  securities  law  limitations  and other
factors.  Repurchases  may be  made  over  time  in  open  market  or  privately
negotiated transactions. The repurchase program may be suspended or discontinued
at any time without prior notice.  During the first quarter of 2006, the Company
repurchased 61,408 common shares at an average price of $44.93 per share.

Cash  dividends  of $6.7  million or $0.10 per common share were paid during the
first  quarter of 2006.  On April 25, 2006,  the Board of  Directors  approved a
quarterly cash dividend of $0.15 per common share.  The dividend will be payable
on or about May 31, 2006 to shareholders of record on May 12, 2006.

BOK Financial and subsidiary  banks are subject to various capital  requirements
administered by federal agencies.  Failure to meet minimum capital  requirements
can result in certain mandatory and possibly additional discretionary actions by
regulators  that could  have a  material  impact on  operations.  These  capital
requirements  include  quantitative   measures  of  assets,   liabilities,   and
off-balance  sheet items. The capital  standards are also subject to qualitative
judgments by the regulators.  The capital ratios for BOK Financial are presented
in Table 20.


--------------------------------------------------------------------------------------------------------------------
Table 20 - Capital Ratios                    March 31,       Dec. 31,      Sept. 30,      June 30,      March 31,
                                               2006            2005           2005          2005          2005
                                          --------------------------------------------------------------------------
Average shareholders' equity
                                                                                            
  to average assets                            9.51%           9.30%          9.54%          9.56%         9.93%
Risk-based capital:
  Tier 1 capital                              10.16            9.85           9.71           9.84         10.19
  Total capital                               12.41           12.09          12.04          12.54         11.78
Leverage                                       8.60            8.34           8.01           8.08          8.36



 24

OFF-BALANCE SHEET ARRANGEMENTS

During 2002, BOK Financial  agreed to a limited price  guarantee on a portion of
the common  shares  issued to  purchase  Bank of  Tanglewood.  Any holder of BOK
Financial common shares issued in this acquisition may annually make a claim for
the excess of the  guaranteed  price over the actual  sales  price of any shares
sold during a 60-day period after each of the first five anniversary dates after
October 25, 2002.  The maximum annual number of shares subject to this guarantee
is 210,069.  The price guarantee is  non-transferable  and  non-cumulative.  BOK
Financial  may elect,  in its sole  discretion,  to issue  additional  shares of
common stock or to pay cash to satisfy any obligation under the price guaranty.

The Company will have no  obligation  to issue  additional  common shares or pay
cash to satisfy any benchmark  price  protection  obligation if the market value
per share of BOK  Financial  common stock  remains  above the highest  benchmark
price of $42.53.  The closing price of BOK  Financial  common stock on March 31,
2006 was $47.55 per share.

MARKET RISK

Market risk is a broad term for the risk of economic loss due to adverse changes
in the fair value of a financial instrument.  These changes may be the result of
various factors,  including interest rates,  foreign exchange prices,  commodity
prices or equity prices.  Financial  instruments that are subject to market risk
can be  classified  either as held for trading or held for  purposes  other than
trading.

BOK Financial is subject to market risk primarily  through the effect of changes
in interest  rates on both its assets held for  purposes  other than trading and
trading assets.  The effects of other changes,  such as foreign  exchange rates,
commodity  prices or equity  prices do not pose  significant  market risk to BOK
Financial. BOK Financial has no material investments in assets that are affected
by  changes  in  foreign  exchange  rates or equity  prices.  Energy  derivative
contracts,  which are  affected  by changes in  commodity  prices,  are  matched
against offsetting contracts as previously discussed.

Responsibility  for  managing  market  risk  rests  with the  Asset /  Liability
Committee  that operates  under policy  guidelines  established  by the Board of
Directors. The acceptable negative variation in net interest revenue, net income
or economic value of equity due to a specified  basis point increase or decrease
in interest  rates is generally  limited by these  guidelines to +/- 10%.  These
guidelines also set maximum levels for short-term borrowings, short-term assets,
public funds, and brokered deposits,  and establish minimum levels for unpledged
assets,  among  other  things.  Compliance  with these  guidelines  is  reviewed
monthly.

INTEREST RATE RISK - OTHER THAN TRADING

BOK Financial  has a large portion of its earning  assets in variable rate loans
and  a  large  portion  of  its  liabilities  in  demand  deposit  accounts  and
interest-bearing  transaction accounts. Changes in interest rates affect earning
assets  more  rapidly  than  interest-bearing  liabilities  in the  short  term.
Management  has  adopted  several   strategies  to  reduce  this  interest  rate
sensitivity.  As previously  noted in the Net Interest  Revenue  section of this
report,  management  acquires  securities  that are funded by  borrowings in the
capital  markets.  The average  duration of these  securities  is expected to be
approximately  2.8  years  based on a range  of  interest  rate  and  prepayment
assumptions.  The funds borrowed to purchase these securities  generally reprice
within 90 days.

BOK  Financial  also uses  interest  rate swaps in managing  its  interest  rate
sensitivity. These products are generally used to more closely match interest on
certain  fixed-rate  loans with funding  sources and long-term  certificates  of
deposit  with earning  assets.  During the first  quarter of 2006,  net interest
revenue  was  reduced  by  $1.9  million  from  periodic  settlements  of  these
contracts.  Net interest  revenue was  increased by $366  thousand from periodic
settlements of these contracts in the first quarter of 2005. These contracts are
carried  on the  balance  sheet at fair  value  and  changes  in fair  value are
reported in income as derivatives  gains or losses.  A net loss of $309 thousand
was  recognized  in 2006  compared  to a net gain of $778  thousand in 2005 from
adjustments  of these swaps and hedged  liabilities  to fair value.  Credit risk
from interest rate swaps is closely  monitored as part of our overall process of
managing credit exposure to other financial institutions.

The effectiveness of these strategies in managing the overall interest rate risk
is evaluated through the use of an asset/liability model. BOK Financial performs
a sensitivity  analysis to identify more dynamic  interest rate risk  exposures,
including  embedded option positions,  on net interest  revenue,  net income and
economic value of equity.  A simulation  model is used to estimate the effect of
changes in interest rates over the next 12 and 24 months based on eight interest
rate  scenarios.  Two  specified  interest  rate  scenarios are used to evaluate
interest rate risk against policy

 25

guidelines.  The first  scenario  assumes a sustained  parallel  200 basis point
increase and the second assumes a sustained parallel 200 basis point decrease in
interest  rates.  The Company also  performs a sensitivity  analysis  based on a
"most likely"  interest rate  scenario,  which includes  non-parallel  shifts in
interest  rates.  An  independent  source is used to  determine  the most likely
interest rate scenario.

The Company's  primary  interest rate exposures  include the Federal Funds rate,
which affects short-term borrowings, the prime lending rate and LIBOR, which are
the basis for much of the  variable-rate  loan pricing.  Additionally,  mortgage
rates directly affect the prepayment speeds for  mortgage-backed  securities and
mortgage servicing rights.  Derivative financial instruments and other financial
instruments   used  for  purposes  other  than  trading  are  included  in  this
simulation.  The model incorporates assumptions regarding the effects of changes
in interest rates and account balances on indeterminable maturity deposits based
on a combination  of historical  analysis and expected  behavior.  The impact of
planned  growth and new  business  activities  is factored  into the  simulation
model.  The  effects  of  changes  in  interest  rates on the value of  mortgage
servicing  rights are excluded from Table 21 due to the extreme  volatility over
such a large rate range.  The effects of interest  rate  changes on the value of
mortgage  servicing  rights and  securities  identified  as economic  hedges are
presented in the Lines of Business - Mortgage Banking section of this report.

The  simulations  used to manage  market risk are based on numerous  assumptions
regarding  the effects of changes in interest  rates on the timing and extent of
repricing  characteristics,  future  cash  flows and  customer  behavior.  These
assumptions  are  inherently  uncertain  and,  as a  result,  the  model  cannot
precisely estimate net interest revenue,  net income or economic value of equity
or  precisely  predict  the  impact  of higher  or lower  interest  rates on net
interest  revenue,  net income or economic value of equity.  Actual results will
differ from simulated results due to timing, magnitude and frequency of interest
rate changes, market conditions and management strategies, among other factors.


Table 21 - Interest Rate Sensitivity
 (Dollars in Thousands)

                                      200 bp Increase                200 bp Decrease                Most Likely
                                 --------------------------    ---------------------------    -------------------------
                                     2006         2005            2006          2005             2006         2005
                                 ------------- ------------    ------------ --------------    ------------ ------------
Anticipated impact over the
   next twelve months on
                                                                                                
   net interest revenue           $     6,413    $ 7,242         $ (4,174)        ***          $     3,889     $ 7,270
                                          1.2%       1.6%            (0.8)%       ***                  0.7%         1.6%
-----------------------------------------------------------------------------------------------------------------------
***A 200 basis point decrease was not computed in 2005 due to low market interest rates.


TRADING ACTIVITIES

BOK  Financial  enters  into  trading  activities  both as an  intermediary  for
customers and for its own account.  As an intermediary,  BOK Financial will take
positions in securities, generally mortgage-backed securities, government agency
securities,  and municipal  bonds.  These securities are purchased for resale to
customers,  which include individuals,  corporations,  foundations and financial
institutions.  BOK Financial will also take trading  positions in U.S.  Treasury
securities,  mortgage-backed  securities,  municipal bonds and financial futures
for its own account.  These positions are taken with the objective of generating
trading profits. Both of these activities involve interest rate risk.

A variety  of  methods  are used to manage  the  interest  rate risk of  trading
activities.  These  methods  include  daily  marking of all  positions to market
value,  independent  verification of inventory pricing,  and position limits for
each trading activity.  Hedges in either the futures or cash markets may be used
to reduce the risk  associated with some trading  programs.  The Risk Management
Department  monitors trading activity daily and reports to senior management and
the Risk Oversight and Audit  Committee of the BOK Financial  Board of Directors
any exceptions to trading position limits and risk management policy exceptions.

Management  uses a Value at Risk ("VAR")  methodology to measure the market risk
inherent in its trading  activities.  VAR is  calculated  based upon  historical
simulations  over the past five years  using a variance /  covariance  matrix of
interest rate changes.  It represents an amount of market loss that is likely to
be exceeded only one out of every 100 two-week  periods.  Trading  positions are
managed within guidelines  approved by the Board of Directors.  These guidelines
limit the VAR to $1.8 million. At March 31, 2006, the VAR was $583 thousand. The
greatest value at risk during the quarter was $1.1 million.

 26

CONTROLS AND PROCEDURES

As required by Rule 13a-15(b),  BOK Financial's management,  including the Chief
Executive Officer and Chief Financial Officer, conducted an evaluation as of the
end of the period covered by their report, of the effectiveness of the company's
disclosure  controls and  procedures as defined in Exchange Act Rule  13a-15(e).
Based on that  evaluation,  the Chief  Executive  Officer  and  Chief  Financial
Officer concluded that the disclosure  controls and procedures were effective as
of the end of the period covered by this report.  As required by Rule 13a-15(d),
BOK  Financial's  management,  including the Chief  Executive  Officer and Chief
Financial  Officer,  also  conducted an  evaluation  of the  company's  internal
controls  over  financial  reporting to determine  whether any changes  occurred
during the quarter covered by this report that have materially affected,  or are
reasonably  likely to materially  affect,  the company's  internal controls over
financial  reporting.  Based on that  evaluation,  there has been no such change
during the quarter covered by this report.

FORWARD-LOOKING STATEMENTS

This report contains  forward-looking  statements that are based on management's
beliefs, assumptions, current expectations, estimates, and projections about BOK
Financial,  the financial  services  industry and the economy in general.  Words
such as "anticipates," "believes," "estimates," "expects," "forecasts," "plans,"
"projects,"  variations  of such words and similar  expressions  are intended to
identify such forward-looking  statements.  Management judgments relating to and
discussion of the provision and reserve for loan losses involve  judgments as to
expected events and are inherently forward-looking statements.  Assessments that
BOK Financial's  acquisitions  and other growth endeavors will be profitable are
necessary statements of belief as to the outcome of future events, based in part
on  information  provided by others  that BOK  Financial  has not  independently
verified.  These statements are not guarantees of future performance and involve
certain risks,  uncertainties and assumptions that are difficult to predict with
regard to timing, extent, likelihood and degree of occurrence. Therefore, actual
results and outcomes may materially differ from what is expressed,  implied,  or
forecasted in such  forward-looking  statements.  Internal and external  factors
that might  cause such a  difference  include,  but are not  limited to: (1) the
ability to fully realize  expected cost savings from mergers within the expected
time frames, (2) the ability of other companies on which BOK Financial relies to
provide  goods and  services  in a timely and  accurate  manner,  (3) changes in
interest  rates and  interest  rate  relationships,  (4) demand for products and
services,  (5) the  degree of  competition  by  traditional  and  nontraditional
competitors,  (6) changes in banking regulations,  tax laws, prices, levies, and
assessments, (7) the impact of technological advances and (8) trends in customer
behavior  as well as  their  ability  to  repay  loans.  BOK  Financial  and its
affiliates undertake no obligation to update, amend, or clarify  forward-looking
statements, whether as a result of new information, future events or otherwise.

 27


---------------------------------------------------------------------------------------------
Consolidated Statements of Earnings (Unaudited)
(In Thousands Except Share and Per Share Data)
                                                                    Three Months Ended
                                                                         March 31,
                                                                  2006             2005
                                                               ------------------------------
INTEREST REVENUE
                                                                      
Loans                                                       $    165,927    $    118,810
Taxable securities                                                55,046          49,356
Tax-exempt securities                                              2,209           1,793
---------------------------------------------------------------------------------------------
   Total securities                                               57,255          51,149
---------------------------------------------------------------------------------------------
Trading securities                                                   164             181
Funds sold and resell agreements                                     239             164
---------------------------------------------------------------------------------------------
   Total interest revenue                                        223,585         170,304
---------------------------------------------------------------------------------------------
INTEREST EXPENSE
Deposits                                                          72,854          43,614
Borrowed funds                                                    28,422          16,869
Subordinated debentures                                            4,983           2,227
---------------------------------------------------------------------------------------------
   Total interest expense                                        106,259          62,710
---------------------------------------------------------------------------------------------
Net Interest Revenue                                             117,326         107,594
Provision for Credit Losses                                        3,400           2,000
---------------------------------------------------------------------------------------------
Net Interest Revenue After Provision for Credit Losses           113,926         105,594
---------------------------------------------------------------------------------------------
OTHER OPERATING REVENUE
Brokerage and trading revenue                                     12,010          11,336
Transaction card revenue                                          18,508          16,543
Trust fees and commissions                                        17,945          16,016
Service charges and fees on deposit accounts                      23,986          22,173
Mortgage banking revenue                                           6,789           5,578
Other revenue                                                     10,811           7,397
---------------------------------------------------------------------------------------------
Total fees and commissions                                        90,049          79,043
---------------------------------------------------------------------------------------------
Gain on sales of assets                                              918             972
Loss on securities, net                                           (1,221)         (2,637)
Gain (loss) on derivatives, net                                     (309)            778
---------------------------------------------------------------------------------------------
Total other operating revenue                                     89,437          78,156
---------------------------------------------------------------------------------------------
OTHER OPERATING EXPENSE
Personnel                                                         71,232          58,439
Business promotion                                                 4,803           4,430
Professional fees and services                                     3,914           3,619
Net occupancy and equipment                                       13,026          12,094
Data processing and communications                                16,995          15,099
Printing, postage and supplies                                     3,905           3,615
Net losses and operating expenses of repossessed  assets             219             308
Amortization of intangible assets                                  1,370           1,537
Mortgage banking costs                                             3,087           3,613
Change in fair value of mortgage servicing rights                 (7,081)              -
Recovery for impairment of mortgage servicing rights                   -          (5,624)
Other expense                                                      5,909           5,029
---------------------------------------------------------------------------------------------
Total other operating expense                                    117,379         102,159
---------------------------------------------------------------------------------------------
Income Before Taxes                                               85,984          81,591
Federal and state income tax                                      31,236          29,536
---------------------------------------------------------------------------------------------
Net Income                                                  $     54,748    $     52,055
---------------------------------------------------------------------------------------------

Earnings Per Share:
---------------------------------------------------------------------------------------------
   Basic                                                    $      0.82     $      0.87
---------------------------------------------------------------------------------------------
   Diluted                                                  $      0.81     $      0.78
---------------------------------------------------------------------------------------------

Average Shares Used in Computation:
---------------------------------------------------------------------------------------------
   Basic                                                        66,715,396      59,432,812
---------------------------------------------------------------------------------------------
   Diluted                                                      67,260,659      66,946,765
---------------------------------------------------------------------------------------------


See accompanying notes to consolidated financial statements.

 28


--------------------------------------------------------------------------------------------------------------------
Consolidated Balance Sheets
(In Thousands Except Share Data)

                                                                    March 31,      December 31,        March 31,
                                                                      2006             2005               2005
                                                                  --------------------------------------------------
                                                                   (Unaudited)                          (Unaudited)
ASSETS
                                                                                          
Cash and due from banks                                        $      610,563    $      684,857    $      505,412
Funds sold and resell agreements                                       25,720            14,465            14,861
Trading securities                                                     26,055            18,633            13,381
Securities:
  Available for sale                                                4,771,401         4,821,575         3,890,031
  Available for sale securities pledged to creditors                        -                 -           689,949
  Investment (fair value:  March 31, 2006 - $232,468;
    December 31, 2005 - $243,406;
    March 31, 2005 - $221,906)                                        237,224           245,125           224,425
  Mortgage trading securities                                          64,704                 -                 -
--------------------------------------------------------------------------------------------------------------------
    Total securities                                                5,073,329         5,066,700         4,804,405
--------------------------------------------------------------------------------------------------------------------
Loans                                                               9,201,959         9,139,978         8,085,966
Less reserve for loan losses                                         (104,143)         (103,876)         (108,958)
--------------------------------------------------------------------------------------------------------------------
    Loans, net of reserve                                           9,097,816         9,036,102         7,977,008
--------------------------------------------------------------------------------------------------------------------
Premises and equipment, net                                           177,959           179,627           172,118
Accrued revenue receivable                                            102,759            99,874            78,577
Intangible assets, net                                                261,652           263,022           241,057
Mortgage servicing rights, net                                         68,608            54,097            50,105
Real estate and other repossessed assets                                8,196             8,476             3,187
Bankers' acceptances                                                   35,315            33,001            23,513
Receivable on unsettled security transactions                               -                 -            50,115
Derivative contracts                                                  401,444           452,878           341,269
Other assets                                                          411,353           415,337           336,080
--------------------------------------------------------------------------------------------------------------------
         Total assets                                          $   16,300,769    $   16,327,069    $   14,611,088
--------------------------------------------------------------------------------------------------------------------

LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing demand deposits                            $    1,784,587    $    1,865,948    $    1,940,789
Interest-bearing deposits:
  Transaction                                                       5,144,120         5,257,295         3,905,998
  Savings                                                             159,471           154,015           166,323
  Time                                                              4,220,068         4,098,060         3,721,430
--------------------------------------------------------------------------------------------------------------------
  Total deposits                                                   11,308,246        11,375,318         9,734,540
--------------------------------------------------------------------------------------------------------------------
Funds purchased and repurchase agreements                           1,622,185         1,337,911         1,881,559
Other borrowings                                                      833,114         1,054,298           873,217
Subordinated debentures                                               294,130           295,964           149,117
Accrued interest, taxes and expense                                    92,495            92,219            76,904
Bankers' acceptances                                                   35,315            33,001            23,513
Due on unsettled security transactions                                  2,142             8,429                 -
Derivative contracts                                                  419,776           466,669           356,579
Other liabilities                                                     127,931           124,106           100,455
--------------------------------------------------------------------------------------------------------------------
         Total liabilities                                         14,735,334        14,787,915        13,195,884
--------------------------------------------------------------------------------------------------------------------
Shareholders' equity:
Preferred stock                                                             -                 -                12
Common stock ($.00006 par value; 2,500,000,000
  shares authorized; shares issued and outstanding:
  March 31, 2006 - 68,214,101;  December 31, 2005
  -  67,904,533; March 31, 2005 - 60,544,085)                               4                 4                 4
Capital surplus                                                       666,800           656,579           638,679
Retained earnings                                                   1,038,859           990,422           860,941
Treasury stock (shares at cost: March 31, 2006 -  1,331,064;
  December 31, 2005 - 1,202,125; March 31, 2005 - 1,056,048)          (45,915)          (40,040)          (33,443)
Accumulated other comprehensive loss                                  (94,313)          (67,811)          (50,989)
--------------------------------------------------------------------------------------------------------------------
         Total shareholders' equity                                 1,565,435         1,539,154         1,415,204
--------------------------------------------------------------------------------------------------------------------
         Total liabilities and shareholders' equity            $   16,300,769    $   16,327,069    $   14,611,088
--------------------------------------------------------------------------------------------------------------------

See accompanying notes to consolidated financial statements.

 29


---------------------------------------------------------------------------------------------------------------------------
Consolidated Statements of Changes in
Shareholders' Equity (Unaudited)
(In Thousands)
                                                             Accumulated
                         Preferred Stock     Common Stock       Other                           Treasury Stock
                       ------------------------------------ Comprehensive  Capital  Retained   ----------------
                         Shares   Amount    Shares   Amount     Loss       Surplus  Earnings   Shares    Amount     Total
                       ----------------------------------------------------------------------------------------------------
Balances at
                                                                                  
  December 31, 2004     249,975    $ 12     60,421  $   4     $(11,625)    $631,747  $809,261     998  $(30,905)$1,398,494
Comprehensive income:
  Net income                  -       -          -      -            -            -    52,055       -         -     52,055
  Other comprehensive
     income, net of tax (1)   -       -          -      -      (39,364)           -         -       -         -    (39,364)
                                                                                                                 ----------
    Comprehensive income                                                                                            12,691
                                                                                                                 ----------
Treasury stock purchase       -       -          -      -            -            -         -      30    (1,189)    (1,189)
Exercise of stock options     -       -        123      -            -        3,361         -      28    (1,349)     2,012
Tax benefit on exercise of
  stock options               -       -          -      -            -          418         -       -         -        418
Stock-based compensation      -       -          -      -            -        3,153         -       -         -      3,153
Cash dividends on
  preferred stock             -       -          -      -            -            -      (375)      -         -       (375)
---------------------------------------------------------------------------------------------------------------------------

Balances at
  March 31, 2005        249,975    $ 12     60,544  $   4     $(50,989)    $638,679  $860,941   1,056  $(33,443)$1,415,204
---------------------------------------------------------------------------------------------------------------------------

Balances at
  December 31, 2005           -    $  -     67,905  $   4     $(67,811)    $656,579  $990,422   1,202  $(40,040)$1,539,154
Effect of
   implementing FAS 156,
   net of income taxes        -       -          -      -            -            -       383       -         -        383
Comprehensive income:
   Net income                 -       -          -      -            -            -    54,748       -         -     54,748
   Other comprehensive        -       -          -      -      (26,502)           -         -       -         -    (26,502)
     income, net of tax (1)
                                                                                                                 ----------
    Comprehensive income                                                                                            28,246
                                                                                                                 ----------
Treasury stock purchase       -       -          -      -            -            -         -      61    (2,759)    (2,759)
Exercise of stock options     -       -        309      -            -        7,554         -      68    (3,116)     4,438
Tax benefit on exercise of
   stock options              -       -          -      -            -        1,140         -       -         -      1,140
Stock-based compensation      -       -          -      -            -        1,527         -       -         -      1,527
Cash dividends on
   common stock               -       -          -      -            -            -    (6,694)      -         -     (6,694)
---------------------------------------------------------------------------------------------------------------------------

Balances at
    March 31, 2006            -    $  -     68,214  $   4     $(94,313)    $666,800$1,038,859   1,331  $(45,915)$1,565,435
---------------------------------------------------------------------------------------------------------------------------


(1)                                         March 31, 2006     March 31, 2005
                                            --------------     --------------
Changes in other comprehensive loss:
  Unrealized losses on securities            $    (42,660)  $       (63,729)
  Unrealized losses on cash flow hedges              (187)             (607)
  Tax benefit on unrealized losses                 15,567            23,290
  Reclassification adjustment for losses
    realized and included in net income             1,221             2,637
  Reclassification adjustment for tax
    benefit on realized losses                       (443)             (955)
                                           -----------------------------------
Net change in other comprehensive loss      $     (26,502)   $      (39,364)
                                           -----------------------------------

See accompanying notes to consolidated financial statements.

 30


--------------------------------------------------------------------------------------------------------------------
Consolidated Statements of Cash Flows (Unaudited)
(In Thousands)
                                                                                  Three Months Ended March 31,
                                                                              --------------------------------------
                                                                                      2006               2005
                                                                              --------------------------------------
Cash Flows From Operating Activities:
                                                                                            
Net income                                                                      $     54,748      $     52,055
Adjustments to reconcile net income to net cash provided by operating
activities:
  Provision for credit losses                                                          3,400             2,000
  Change in fair value of mortgage servicing rights                                   (7,081)                -
  Recovery for mortgage servicing rights impairment                                        -            (5,624)
  Unrealized losses from derivatives                                                   3,358             5,768
  Tax benefit on exercise of stock options                                            (1,140)              418
  Stock-based compensation                                                             2,536            (1,508)
  Depreciation and amortization                                                       10,652            10,986
  Net accretion of securities discounts and premiums                                  (1,060)           (2,001)
  Net (gain) loss on sale of assets                                                   (2,469)              271
  Mortgage loans originated for resale                                              (162,905)         (117,377)
  Proceeds from sale of mortgage loans held for resale                               176,147           116,153
  Change in trading securities                                                        (7,422)           (3,689)
  Change in accrued revenue receivable                                                (2,885)            1,067
  Change in other assets                                                              11,777           (12,750)
  Change in accrued interest, taxes and expense                                        1,416             5,842
  Change in other liabilities                                                        (13,996)           20,470
--------------------------------------------------------------------------------------------------------------------
Net cash provided by operating activities                                             65,076            72,081
--------------------------------------------------------------------------------------------------------------------
Cash Flows From Investing Activities:
  Proceeds from maturities of investment securities                                   10,828             7,497
  Proceeds from maturities of available for sale securities                          173,249           274,197
  Purchases of investment securities                                                  (2,983)          (10,888)
  Purchases of available for sale securities                                        (271,202)         (658,088)
  Proceeds from sales of available for sale securities                                36,576           330,648
  Loans originated or acquired net of principal collected                           (149,739)         (232,738)
  Proceeds from derivative asset contracts                                             2,340             2,183
  Net change in other investment assets                                                  410             1,294
  Proceeds from disposition of assets                                                 75,196            78,086
  Purchases of assets                                                                (12,828)           (7,608)
--------------------------------------------------------------------------------------------------------------------
  Net cash used by investing activities                                             (138,153)         (215,417)
--------------------------------------------------------------------------------------------------------------------
Cash Flows From Financing Activities:
  Net change in demand deposits, transaction deposits and savings accounts          (189,080)          (17,436)
  Net change in time deposits                                                        122,605            83,624
  Net change in other borrowings                                                      63,090           184,269
  Payments on derivative liability contracts                                          (1,754)           (5,928)
  Net change in derivative margin accounts                                            25,339          (119,217)
  Change in amount receivable (due) on unsettled security transactions                (6,287)            6,758
  Issuance of preferred, common and treasury stock, net                                4,438             2,012
  Tax benefit on exercise of stock options                                             1,140                 -
  Repurchase of common stock                                                          (2,759)           (1,189)
  Dividends paid                                                                      (6,694)             (375)
--------------------------------------------------------------------------------------------------------------------
Net cash provided by financing activities                                             10,038           132,518
--------------------------------------------------------------------------------------------------------------------
Net decrease in cash and cash equivalents                                            (63,039)          (10,818)
Cash and cash equivalents at beginning of period                                     699,322           531,091
--------------------------------------------------------------------------------------------------------------------
Cash and cash equivalents at end of period                                      $    636,283      $    520,273
--------------------------------------------------------------------------------------------------------------------


Cash paid for interest                                                          $    105,085      $     63,545
--------------------------------------------------------------------------------------------------------------------
Cash paid for taxes                                                             $      6,440      $      4,620
--------------------------------------------------------------------------------------------------------------------
Net loans transferred to repossessed real estate
    and other assets                                                            $        957      $      1,589
--------------------------------------------------------------------------------------------------------------------


See accompanying notes to consolidated financial statements.

 31

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

(1) ACCOUNTING POLICIES

BASIS OF PRESENTATION

The unaudited  consolidated  financial  statements of BOK Financial  Corporation
("BOK  Financial"  or "the  Company")  have been  prepared  in  accordance  with
accounting  principles for interim financial  information  generally accepted in
the  United  States  and with the  instructions  to Form 10-Q and  Article 10 of
Regulation  S-X.  Accordingly,  they do not include all of the  information  and
footnotes  required by generally  accepted  accounting  principles  for complete
financial statements. In the opinion of management,  all adjustments (consisting
of normal recurring accruals)  considered necessary for a fair presentation have
been included.

The  unaudited   consolidated  financial  statements  include  accounts  of  BOK
Financial  and its  subsidiaries,  principally  Bank of  Oklahoma,  N.A. and its
subsidiaries  ("BOk"),  Bank of Texas,  N.A.,  Bank of Arkansas,  N.A.,  Bank of
Albuquerque,  N.A. Colorado State Bank and Trust,  N.A., Bank of Arizona,  N.A.,
and BOSC, Inc. Certain prior period amounts have been reclassified to conform to
current  period  classification.  Reclassification  affecting  the  Consolidated
Balance  Sheet as of December 31, 2005 included an increase in other assets from
$341 million to $415 million and accrued  interest,  taxes and expenses from $18
million to $92 million. This reclassification consistently presents deferred tax
assets for all periods presented.

The financial  information  should be read in conjunction  with BOK  Financial's
2005 Form 10-K filed with the Securities and Exchange Commission, which contains
audited financial statements.

NEWLY ADOPTED ACCOUNTING POLICIES

BOK Financial  adopted  Statement of Financial  Accounting  Standards No. 123-R,
"Share-Based  Payments  (FAS  123-R) as of January 1, 2006.  FAS 123-R  requires
companies to recognize in income  statements the grant-date  fair value of stock
options and other  equity-based  compensation  issued to employees.  Share-based
payments that will settle in equity  instruments are measured at grant-date fair
value and not remeasured for  subsequent  changes in fair value.  FAS 123-R also
requires that share-based  payments the meet specified criteria to be classified
as liability  awards and carried at current fair value.  Fair value of liability
awards are remeasured at each balance sheet date until the award is settled. BOK
Financial had  previously  adopted the preferred  income  statement  recognition
methods of the original FAS 123  retroactively to its effective date of December
15, 1994. The adoption of FAS 123-R did not  significantly  affect the Company's
financial statements.

Stock  options  outstanding  at March  31,  2006  totaled  3,877,843,  including
1,027,012  of vested  options  and  2,850,831  of unvested  options.  Management
expects  that  approximately  2.8  million  of the  unvested  options  will vest
according to their  contractual  terms.  The weighted average exercise prices of
vested and unvested options are $26.99 and $40.18, respectively.

The intrinsic value of options  exercised  during the first quarters of 2006 and
2005 was $4.4 million and $2.3 million,  respectively. The Company received cash
proceeds of $4.6  million in the first  quarter of 2006 and $1.9  million in the
first quarter of 2005 from stock options exercised.

The  Financial   Accounting   Standards  Board  issued  Statement  of  Financial
Accounting  Standards No. 156,  "Accounting  for Servicing of Financial  Assets"
("FAS 156") during the first quarter of 2006.  FAS 156 permitted  companies that
service financial assets to elect to carry servicing rights at either fair value
or at the lower of amortized cost or fair value. Previously,  generally accepted
accounting  principles  required  servicing rights to be carried at the lower of
amortized  cost or fair value.  FAS 156 is effective for fiscal years that begin
after September 15, 2006.  Early adoption is permitted as of the beginning of an
entity's fiscal year,  provided that the entity has not yet issued any financial
statements for that year.

FAS 156 also  permitted  companies that service  financial  assets to reclassify
securities  designated  as an economic  hedge of the  servicing  rights from the
available  for sale  classification  to trading  without  tainting  management's
classification of the remaining available for sale securities portfolio.

Effective January 1, 2006, BOK Financial  designated all mortgage loan servicing
rights to be carried at fair value.

 32

An  adjustment  to initially  record  servicing  rights at fair value  increased
retained earnings by $351 thousand, net of income taxes.  Additionally,  certain
specifically-identified  securities  that had been designated as economic hedges
of the mortgage  servicing rights were  reclassified  from available for sale to
trading.  These securities are identified as "mortgage  trading  securities" and
are  separate  from the  Company's  normal  securities  trading  activities.  An
adjustment to initially record these securities at fair value increased retained
earnings by $32 thousand, net of income taxes.

See Note 3 - Mortgage Banking Activities for additional  disclosures required by
FAS 156.


(2) DERIVATIVES

The fair  values of  derivative  contracts  at March 31, 2006 are as follows (in
thousands):
                                                 Assets      Liabilities
                                           -------------------------------
   Customer Risk Management Programs:
         Interest rate contracts                 $32,387         $34,089
         Energy contracts                        358,286         357,092
         Cattle contracts                            554             563
         Foreign exchange contracts               10,217          10,217
--------------------------------------------------------------------------
   Total Customer Derivatives                    401,444         401,961

   Interest Rate Risk Management Programs:
         Interest rate contracts                       -          17,815
--------------------------------------------------------------------------
     Total Derivative Contracts                 $401,444        $419,776
--------------------------------------------------------------------------


(3) MORTGAGE BANKING ACTIVITIES

BOK Financial  implemented  Statement of Financial Accounting Standards No. 156,
"Accounting for Servicing of Financial  Assets" in the first quarter of 2006. An
initial   adjustment  of  the  mortgage   servicing  rights  to  fair  value  of
approximately $351 thousand,  net of income taxes, was recognized as an increase
to retained  earnings in the same period.  Also upon  implementation of FAS 156,
certain securities  designated as an economic hedge of mortgage servicing rights
were  transferred  from  the  available  for  sale  classification  to  trading.
Approximately $32 thousand was transferred from accumulated other  comprehensive
income to retained earnings for the net of tax effect of this reclassification.

At March 31, 2006,  BOK Financial  owned the rights to service  57,211  mortgage
loans with  outstanding  principal  balances  of $5.0  billion,  including  $439
million  serviced  for  affiliates.  The  weighted  average  interest  rate  and
remaining term was 6.13% and 276 months, respectively.

On March 31, 2006,  the Company paid  approximately  $6.8 million to acquire the
rights to service  approximately  $480 million of mortgage loans.  Substantially
all of these loans are to borrowers in our primary market areas.

For the three months  ended March 31, 2006 and 2005,  mortgage  banking  revenue
includes servicing fee income of $4.0 million and $4.1 million, respectively.

 33

Activity  in  capitalized   mortgage  servicing  rights  and  related  valuation
allowance  during the three  months  ending  March 31,  2006 is as  follows  (in
thousands):


                                           Capitalized Mortgage Servicing Rights
                                    -----------------------------------------------
                                                                                        Valuation
                                            Purchased     Originated       Total        Allowance         Net
                                    --------------------------------------------------------------------------------
Balance at
                                                                                       
    December 31, 2005                    $  8,606       $  52,905     $  61,511     $  (7,414)       $   54,097
Adoption of FAS 156 effective
   January 1, 2006                           (117)         (6,747)       (6,864)        7,414               550
Additions, net                              6,770           2,835         9,605             -             9,605
Change in fair value due to loan runoff      (535)         (2,190)       (2,725)            -            (2,725)
Change in fair value due to market
   changes                                   (116)          7,197         7,081             -             7,081
--------------------------------------------------------------------------------------------------------------------
Balance at  March 31, 2006 (1)           $ 14,608       $  54,000     $  68,608     $       -        $   68,608
--------------------------------------------------------------------------------------------------------------------
(1) Excludes approximately $993,000 of loan servicing rights on mortgage loans
originated prior to the adoption of FAS 122.


Fair  value  is  determined  by  discounting   the  projected  net  cash  flows.
Significant assumptions used to determine fair value are:


                                                            March 31, 2006       December 31, 2005
                                                    -----------------------------------------------------
                                                                                 
Discount rate - risk-free rate plus a market premium            10.11%                 10.85%

Prepayment rate - based upon loan interest rate,
  original term and loan type                               6.50% - 20.20%          10.42% - 20.38%

Loan servicing costs - annually per loan based upon
  loan type                                                    $40 - $63               $35 - $46

Escrow earnings rate - indexed to rates paid on deposit
  accounts with comparable average life                          5.68%                   5.21%


Stratification  of  the  mortgage  loan  servicing   portfolio  and  outstanding
principal  of loans  serviced  by interest  rate at March 31,  2006  follows (in
thousands):


                                               < 5.51%      5.51% - 6.50%    6.51% - 7.50%    => 7.50%      Total
                                           ---------------------------------------------------------------------------
                                                                                           
Fair value                                 $    17,671      $    34,681        $  12,198      $  4,058    $   68,608
----------------------------------------------------------------------------------------------------------------------

Outstanding principal of loans serviced (1)$ 1,137,200      $ 2,178,600        $ 861,300      $261,500    $4,438,600
----------------------------------------------------------------------------------------------------------------------


(1)  Excludes  outstanding  principal  of $439  million for loans  serviced  for
affiliates  and $62 million of mortgage loans for which there are no capitalized
mortgage servicing rights.


(4)  DISPOSAL OF AVAILABLE FOR SALE SECURITIES

Sales of available for sale  securities  resulted in gains and losses as follows
(in thousands):

                                              Three Months Ended March 31,
                                           ----------------------------------
                                               2006                2005
                                           --------------     ---------------
Proceeds                                 $      36,576     $      330,648
Gross realized gains                               714                535
Gross realized losses                           (1,935)            (3,172)
Related federal and state income
   tax benefit                                    (444)              (955)

 34

(5) EMPLOYEE BENEFITS

BOK Financial has sponsored a defined benefit Pension Plan for all employees who
satisfied  certain age and service  requirements.  During the fourth  quarter of
2005,  the  Company  modified  the  Pension  Plan to  curtail  benefit  accruals
effective April 1, 2006. During the first quarter of 2006 and 2005, net periodic
pension cost was approximately $1.8 million and $1.6 million, respectively.

The Company made no Pension Plan contributions  during the first quarter of 2006
and 2005.

Management  has been advised that no minimum  contribution  will be required for
2006. Due to the curtailment,  the maximum  allowable  contribution for 2006 has
not yet been determined.


(6) SHAREHOLDERS' EQUITY

On April 25, 2006, the Board of Directors of BOK Financial  Corporation approved
a $0.15 per share quarterly common stock dividend.  The quarterly  dividend will
be payable on or about May 31, 2006 to shareholders of record on May 12, 2006.


(7)  EARNINGS PER SHARE

The following table presents the  computation of basic and diluted  earnings per
share (dollars in thousands, except share data):


                                                              Three Months Ended
                                                          ---------------------------
                                                            March 31,    March 31,
                                                               2006         2005
                                                          ---------------------------
Numerator:
                                                                   
   Net income                                               $  54,748    $  52,055
   Preferred stock dividends                                        -         (375)
-------------------------------------------------------------------------------------
Numerator for basic earnings per share - income
   available to common shareholders                            54,748       51,680
-------------------------------------------------------------------------------------
Effect of dilutive securities:
   Preferred stock dividends                                        -          375
-------------------------------------------------------------------------------------
Numerator for diluted earnings per share - income available
   to common shareholders after assumed conversion          $  54,748    $  52,055
-------------------------------------------------------------------------------------
Denominator:
   Denominator for basic earnings per share - weighted
     average shares                                        66,715,396   59,432,812
   Effect of dilutive securities:
     Employee stock compensation plans (1)                    545,263      593,285
     Convertible preferred stock                                    -    6,920,668
-------------------------------------------------------------------------------------
Dilutive potential common shares                              545,263    7,513,953
-------------------------------------------------------------------------------------
Denominator for diluted earnings per share - adjusted
   weighted average shares and assumed conversions         67,260,659   66,946,765
-------------------------------------------------------------------------------------
Basic earnings per share                                      $  0.82      $  0.87
-------------------------------------------------------------------------------------
Diluted earnings per share                                    $  0.81      $  0.78
-------------------------------------------------------------------------------------

(1) Excludes employee stock options with exercise prices
    greater than current market price.                      1,598,709      857,197


 35

(8)  REPORTABLE SEGMENTS

Reportable segments  reconciliation to the Consolidated Financial Statements for
the three months ended March 31, 2006 is as follows (in thousands):


                                                  Net            Other           Other
                                                Interest       Operating        Operating          Net          Average
                                                Revenue        Revenue(1)        Expense          Income         Assets
                                              ------------------------------------------------------------------------------
                                                                                            
Total reportable segments                  $  119,560      $  90,226       $  110,259       $      59,434  $  17,026,747
Unallocated items:
   Tax-equivalent adjustment                    1,522              -                -               1,522              -
   Funds management and other                  (3,756)           741            7,120              (6,208)      (756,508)
                                              ------------------------------------------------------------------------------

BOK Financial consolidated                 $  117,326      $  90,967       $  117,379       $      54,748  $  16,270,239
                                              ==============================================================================


(1) Excluding financial instruments gains/(losses).

Reportable segments  reconciliation to the Consolidated Financial Statements for
the three months ended March 31, 2005 is as follows (in thousands):


                                                 Net             Other          Other
                                               Interest        Operating       Operating          Net           Average
                                               Revenue         Revenue(1)       Expense          Income          Assets
                                              ------------------------------------------------------------------------------
                                                                                            
Total reportable segments                  $  101,059      $  82,254       $  104,851       $      45,371  $  14,965,558
Unallocated items:
   Tax-equivalent adjustment                    1,392              -                -               1,392              -
   Funds management and other                   5,143         (2,239)          (2,692)              5,292       (746,703)
                                              ------------------------------------------------------------------------------

BOK Financial consolidated                 $  107,594      $  80,015       $  102,159       $      52,055  $  14,218,855
                                              ==============================================================================


(1) Excluding financial instruments gains/(losses).


(9)  CONTINGENT LIABILITIES

In the ordinary  course of business,  BOK  Financial  and its  subsidiaries  are
subject to legal actions and  complaints.  Management  believes,  based upon the
opinion of counsel,  that the actions and liability or loss,  if any,  resulting
from  the  final  outcomes  of the  proceedings,  will  not be  material  in the
aggregate.


(10) FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK

BOK Financial is a party to financial instruments with off-balance-sheet risk in
the normal course of business to meet the  financing  needs of its customers and
to manage interest rate risk. Those financial  instruments  involve,  to varying
degrees,  elements  of credit  risk in excess of the  amount  recognized  in BOK
Financial's Consolidated Balance Sheets. Exposure to credit loss in the event of
nonperformance by the other party to the financial instrument for commitments to
extend  credit and  standby  letters of credit is  represented  by the  notional
amount of those instruments.

As of March 31,  2006,  outstanding  commitments  and  letters of credit were as
follows (in thousands):

                                               March 31,
                                                2006
                                            --------------
Commitments to extend credit                 $4,660,153
Standby letters of credit                       495,006
Commercial letters of credit                      9,270
Commitments to purchase securities                4,000

 36


------------------------------------------------------------------------------------------------------------------------------
Quarterly Financial Summary - Unaudited
Consolidated Daily Average Balances, Average Yields and Rates
(Dollars in Thousands, Except Per Share Data)
                                                                           Three Months Ended
                                         -------------------------------------------------------------------------------------
                                                        March 31, 2006                            December 31, 2005
                                         ------------------------------------------      -------------------------------------
                                              Average        Revenue/    Yield /         Average        Revenue/    Yield /
                                              Balance       Expense(1)     Rate          Balance       Expense(1)     Rate
                                         -------------------------------------------------------------------------------------
Assets
                                                                                                     
  Taxable securities (3)                  $   4,862,313   $    55,046       4.60%    $   4,816,263   $    53,375       4.44%
  Tax-exempt securities (3)                     262,124         3,465       5.36           243,521         3,046       5.05
------------------------------------------------------------------------------------------------------------------------------
    Total securities (3)                      5,124,437        58,511       4.64         5,059,784        56,421       4.47
------------------------------------------------------------------------------------------------------------------------------
  Trading securities                             16,722           209       5.07            20,595           243       4.68
  Funds sold and resell agreements               21,181           239       4.58            57,656           581       4.00
  Loans (2)                                   9,164,706       166,148       7.35         9,005,546       158,387       6.98
    Less reserve for loan losses                105,135             -         -            108,998             -         -
------------------------------------------------------------------------------------------------------------------------------
  Loans, net of reserve                       9,059,571       166,148       7.44         8,896,548       158,387       7.06
------------------------------------------------------------------------------------------------------------------------------
    Total earning assets (3)                 14,221,911       225,107       6.42        14,034,583       215,632       6.12
------------------------------------------------------------------------------------------------------------------------------
  Cash and other assets                       2,048,328                                  2,168,128
------------------------------------------------------------------------------------------------------------------------------
        Total assets                      $  16,270,239                              $  16,202,711
------------------------------------------------------------------------------------------------------------------------------

Liabilities And Shareholders' Equity
  Transaction deposits                    $   5,327,004   $    31,129       2.37%    $   4,821,627   $    24,075       1.98%
  Savings deposits                              155,554           330       0.86           154,316           292       0.75
  Time deposits                               4,162,952        41,395       4.03         4,216,625        40,083       3.77
------------------------------------------------------------------------------------------------------------------------------
     Total interest-bearing deposits          9,645,510        72,854       3.06         9,192,568        64,450       2.78
------------------------------------------------------------------------------------------------------------------------------
  Funds purchased and repurchase
    agreements                                1,731,983        18,483       4.33         1,812,752        17,914       3.92
  Other borrowings                              882,878         9,939       4.57         1,049,635        10,807       4.08
  Subordinated debentures                       295,792         4,983       6.83           296,021         4,683       6.28
------------------------------------------------------------------------------------------------------------------------------
     Total interest-bearing liabilities      12,556,163       106,259       3.43        12,350,976        97,854       3.14
------------------------------------------------------------------------------------------------------------------------------
  Demand deposits                             1,485,398                                  1,530,504
  Other liabilities                             680,897                                    814,192
  Shareholders' equity                        1,547,781                                  1,507,039
------------------------------------------------------------------------------------------------------------------------------
  Total liabilities and shareholders'
    equity                                $  16,270,239                              $  16,202,711
------------------------------------------------------------------------------------------------------------------------------
  Tax-Equivalent Net Interest Revenue (3)                $    118,848       2.99%                    $    117,778        2.98%
  Tax-Equivalent Net Interest  Revenue
     To Earning Assets (3)                                                  3.39                                         3.34
   Less tax-equivalent adjustment (1)                           1,522                                      1,392
------------------------------------------------------------------------------------------------------------------------------
Net Interest Revenue                                          117,326                                    116,386
Provision for credit losses                                     3,400                                      4,450
Other operating revenue                                        89,437                                     87,344
Other operating expense                                       117,379                                    123,903
------------------------------------------------------------------------------------------------------------------------------
Income before taxes                                            85,984                                     75,377
Federal and state income tax                                   31,236                                     27,219
------------------------------------------------------------------------------------------------------------------------------
Net Income                                                $    54,748                                $    48,158
------------------------------------------------------------------------------------------------------------------------------
Earnings Per Average Common Share Equivalent:
  Net income:
    Basic                                                 $      0.82                                $      0.72
------------------------------------------------------------------------------------------------------------------------------
    Diluted                                               $      0.81                                $      0.72
------------------------------------------------------------------------------------------------------------------------------


(1)  Tax  equivalent  at the  statutory  federal and state rates for the periods
     presented.  The taxable  equivalent  adjustments  shown are for comparative
     purposes.

(2)  The loan averages  included loans on which the accrual of interest has been
     discontinued and are stated net of unearned income.

(3)  Yield calculations exclude security trades that have been recorded on trade
     date with no corresponding interest income.

 37


-------------------------------------------------------------------------------------------------------------------------



                                                   Three Months Ended
-------------------------------------------------------------------------------------------------------------------------
             September 30, 2005                         June 30, 2005                          March 31, 2005
-------------------------------------------------------------------------------------------------------------------------
      Average       Revenue/    Yield /       Average        Revenue/    Yield /      Average       Revenue/    Yield /
      Balance      Expense(1)     Rate        Balance       Expense(1)    Rate        Balance      Expense(1)    Rate
-------------------------------------------------------------------------------------------------------------------------

                                                                                           
  $   4,800,698  $    51,946       4.28%  $   4,831,186   $    51,275       4.32% $   4,628,233  $    49,356       4.32%
        231,097        2,888       4.96         215,360         2,810       5.23        217,571        2,843       5.30
-------------------------------------------------------------------------------------------------------------------------
      5,031,795       54,834       4.31       5,046,546        54,085       4.36      4,845,804       52,199       4.36
-------------------------------------------------------------------------------------------------------------------------
         14,560          171       4.66          11,639           165       5.69         17,205          191       4.50
         44,882          386       3.41          21,170           156       2.96         30,003          164       2.22
      8,635,732      144,954       6.66       8,341,490       133,173       6.40      7,963,177      119,006       6.06
        109,840            -         -          111,056             -         -         111,955            -         -
-------------------------------------------------------------------------------------------------------------------------
      8,525,892      144,954       6.75       8,230,434       133,173       6.49      7,851,222      119,006       6.15
-------------------------------------------------------------------------------------------------------------------------
     13,617,129      200,345       5.83      13,309,789       187,579       5.68     12,744,234      171,560       5.46
-------------------------------------------------------------------------------------------------------------------------
      1,970,746                               1,750,686                               1,474,621
-------------------------------------------------------------------------------------------------------------------------
  $  15,587,875                           $  15,060,475                           $  14,218,855
-------------------------------------------------------------------------------------------------------------------------


  $   4,533,912  $    18,968       1.66%  $   4,323,513   $    16,049       1.49% $   3,920,844  $    13,629       1.41%
        157,772          280       0.70         166,426           285       0.69        159,276          249       0.63
      3,958,948       35,255       3.53       3,710,338        31,499       3.41      3,685,257       29,736       3.27
-------------------------------------------------------------------------------------------------------------------------
      8,650,632       54,503       2.50       8,200,277        47,833       2.34      7,765,377       43,614       2.28
-------------------------------------------------------------------------------------------------------------------------

      2,067,432       17,738       3.40       2,160,031        15,764       2.93      1,704,327       10,190       2.42
      1,047,423        9,510       3.60         914,968         7,224       3.17        971,616        6,679       2.79
        297,284        4,477       5.97         200,038         2,980       5.98        150,752        2,227       5.99
-------------------------------------------------------------------------------------------------------------------------
     12,062,771       86,228       2.84      11,475,314        73,801       2.58     10,592,072       62,710       2.40
-------------------------------------------------------------------------------------------------------------------------
      1,424,102                               1,586,248                               1,895,989
        613,667                                 558,655                                 319,375
      1,487,335                               1,440,258                               1,411,419
-------------------------------------------------------------------------------------------------------------------------
  $  15,587,875                           $  15,060,475                           $  14,218,855
-------------------------------------------------------------------------------------------------------------------------
                 $    114,117      2.99%                  $    113,778      3.10%                $    108,850      3.06%


                                   3.32                                     3.45                                   3.46
                       1,289                                    1,245                                  1,256
-------------------------------------------------------------------------------------------------------------------------
                     112,828                                  112,533                                107,594
                       3,976                                    2,015                                  2,000
                      86,855                                   94,591                                 78,156
                     117,034                                  126,010                                102,159
-------------------------------------------------------------------------------------------------------------------------
                      78,673                                   79,099                                 81,591
                      27,846                                   28,634                                 29,536
-------------------------------------------------------------------------------------------------------------------------
                 $    50,827                              $    50,465                            $    52,055
-------------------------------------------------------------------------------------------------------------------------


                 $      0.77                              $      0.79                            $      0.87
-------------------------------------------------------------------------------------------------------------------------
                 $      0.76                              $      0.75                            $      0.78
-------------------------------------------------------------------------------------------------------------------------



 38


PART II. OTHER INFORMATION

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

     The following table provides  information with respect to purchases made by
or on behalf of the Company or any  "affiliated  purchaser"  (as defined in Rule
10b-18(a)(3) under the Securities Exchange Act of 1934), of the Company's common
stock during the three months ended March 31, 2006.


------------------------ ---------------- ---------------- ------------------------------------ -----------------------------
                          Total Number     Average Price    Total Number of Shares Purchased      Maximum Number of Shares
                            of Shares         Paid per       as Part of Publicly Announced      that May Yet Be Purchased
         Period            Purchased (2)        Share             Plans or Programs (1)               Under the Plans
------------------------ ---------------- ---------------- ------------------------------------ -----------------------------
                                                                                                   
January 1, 2006 to             57,450          $ 46.50                       -                            1,970,000
January 31, 2006
------------------------ ---------------- ---------------- ------------------------------------ -----------------------------
February 1, 2006 to            67,387          $ 44.96                  60,868                            1,909,132
February 28, 2006
------------------------ ---------------- ---------------- ------------------------------------ -----------------------------
March 1, 2006 to                4,364          $ 47.28                     540                            1,908,592
March 31, 2006
------------------------ ---------------- ---------------- ------------------------------------ -----------------------------
Total                         129,201                                    61,408
------------------------ ---------------- ---------------- ------------------------------------ -----------------------------


(1)  The Company had a stock  repurchase  plan that was initially  authorized by
     the  Company's  board of  directors on February 24, 1998 and amended on May
     25, 1999.  Under the terms of that plan, the Company could repurchase up to
     800,000  shares of its common stock.  As of March 31, 2005, the Company had
     repurchased  638,642  shares  under  that  plan.  On April  26,  2005,  the
     Company's board of directors  terminated this authorization and replaced it
     with a new stock  repurchase plan  authorizing the Company to repurchase up
     to two million shares of the Company's  common stock. As of March 31, 2006,
     the Company had repurchased 91,408 shares under the new plan.

(2)  The Company routinely repurchases mature shares from employees to cover the
     exercise  price  and  taxes  in  connection   with  employee  stock  option
     exercises.

Item 6. Exhibits

31.1 Certification  of Chief  Executive  Officer  Pursuant to Section 302 of the
     Sarbanes-Oxley Act of 2002

31.2 Certification  of Chief  Financial  Officer  Pursuant to Section 302 of the
     Sarbanes-Oxley Act of 2002

32   Certification  of Chief  Executive  Officer  and  Chief  Financial  Officer
     Pursuant to 18 U.S.C.  Section 1350, as Adopted  Pursuant to Section 906 of
     the Sarbanes-Oxley Act of 2002


Items 1, 3, 4, and 5 are not applicable and have been omitted.

 39

                                   Signatures


Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.


                                            BOK FINANCIAL CORPORATION
                                            (Registrant)

Date:         May 10, 2006                 /s/ Steven E. Nell
        -----------------------------      ---------------------------------
                                           Steven E. Nell
                                           Executive Vice President and
                                           Chief Financial Officer


                                           /s/ John C. Morrow
                                           -----------------------------------
                                           John C. Morrow
                                           Senior Vice President and Director
                                           of Financial Accounting & Reporting